diff --git a/libcef/browser/alloy/alloy_browser_context.cc b/libcef/browser/alloy/alloy_browser_context.cc
index f97b209aa..ca4ccd05a 100644
--- a/libcef/browser/alloy/alloy_browser_context.cc
+++ b/libcef/browser/alloy/alloy_browser_context.cc
@@ -264,8 +264,8 @@ void AlloyBrowserContext::LoadExtension(
   if (manifest && manifest->GetSize() > 0) {
     CefDictionaryValueImpl* value_impl =
         static_cast<CefDictionaryValueImpl*>(manifest.get());
-    std::unique_ptr<base::DictionaryValue> value_copy(value_impl->CopyValue());
-    extension_system()->LoadExtension(std::move(*value_copy).TakeDict(),
+    auto value = value_impl->CopyValue();
+    extension_system()->LoadExtension(std::move(value.GetDict()),
                                       root_directory, false /* builtin */,
                                       loader_context, handler);
   } else {
diff --git a/libcef/browser/browser_frame.cc b/libcef/browser/browser_frame.cc
index 70ba04c04..91897f657 100644
--- a/libcef/browser/browser_frame.cc
+++ b/libcef/browser/browser_frame.cc
@@ -34,7 +34,7 @@ void CefBrowserFrame::RegisterBrowserInterfaceBindersForFrame(
 }
 
 void CefBrowserFrame::SendMessage(const std::string& name,
-                                  base::Value arguments) {
+                                  base::Value::List arguments) {
   // Always send to the newly created RFH, which may be speculative when
   // navigating cross-origin.
   if (auto host = GetFrameHost(/*prefer_speculative=*/true)) {
diff --git a/libcef/browser/browser_frame.h b/libcef/browser/browser_frame.h
index 734211216..41576a09d 100644
--- a/libcef/browser/browser_frame.h
+++ b/libcef/browser/browser_frame.h
@@ -35,7 +35,8 @@ class CefBrowserFrame
 
  private:
   // cef::mojom::BrowserFrame methods:
-  void SendMessage(const std::string& name, base::Value arguments) override;
+  void SendMessage(const std::string& name,
+                   base::Value::List arguments) override;
   void SendSharedMemoryRegion(const std::string& name,
                               base::ReadOnlySharedMemoryRegion region) override;
   void FrameAttached(mojo::PendingRemote<cef::mojom::RenderFrame> render_frame,
diff --git a/libcef/browser/browser_info_manager.cc b/libcef/browser/browser_info_manager.cc
index ff673cc17..7d75708f5 100644
--- a/libcef/browser/browser_info_manager.cc
+++ b/libcef/browser/browser_info_manager.cc
@@ -514,8 +514,8 @@ void CefBrowserInfoManager::SendNewBrowserInfoResponse(
     if (extra_info) {
       auto extra_info_impl =
           static_cast<CefDictionaryValueImpl*>(extra_info.get());
-      auto extra_info_value = base::WrapUnique(extra_info_impl->CopyValue());
-      params->extra_info = std::move(*extra_info_value);
+      auto extra_info_value = extra_info_impl->CopyValue();
+      params->extra_info = std::move(extra_info_value.GetDict());
     }
   } else {
     // The new browser info response has timed out.
diff --git a/libcef/browser/devtools/devtools_controller.cc b/libcef/browser/devtools/devtools_controller.cc
index 44cd1834e..30f577616 100644
--- a/libcef/browser/devtools/devtools_controller.cc
+++ b/libcef/browser/devtools/devtools_controller.cc
@@ -43,7 +43,7 @@ bool CefDevToolsController::SendDevToolsMessage(
 int CefDevToolsController::ExecuteDevToolsMethod(
     int suggested_message_id,
     const std::string& method,
-    const base::DictionaryValue* params) {
+    const base::Value::Dict* params) {
   CEF_REQUIRE_UIT();
   if (!EnsureAgentHost()) {
     return 0;
@@ -57,11 +57,11 @@ int CefDevToolsController::ExecuteDevToolsMethod(
     next_message_id_ = message_id + 1;
   }
 
-  base::DictionaryValue message;
-  message.SetIntKey("id", message_id);
-  message.SetStringKey("method", method);
+  base::Value::Dict message;
+  message.Set("id", message_id);
+  message.Set("method", method);
   if (params) {
-    message.SetKey("params", params->Clone());
+    message.Set("params", params->Clone());
   }
 
   std::string protocol_message;
diff --git a/libcef/browser/devtools/devtools_controller.h b/libcef/browser/devtools/devtools_controller.h
index acaf13b9b..3bed09ff0 100644
--- a/libcef/browser/devtools/devtools_controller.h
+++ b/libcef/browser/devtools/devtools_controller.h
@@ -51,7 +51,7 @@ class CefDevToolsController : public content::DevToolsAgentHostClient {
   bool SendDevToolsMessage(const base::StringPiece& message);
   int ExecuteDevToolsMethod(int message_id,
                             const std::string& method,
-                            const base::DictionaryValue* params);
+                            const base::Value::Dict* params);
 
   // |observer| must outlive this object or be removed.
   void AddObserver(Observer* observer);
diff --git a/libcef/browser/devtools/devtools_frontend.cc b/libcef/browser/devtools/devtools_frontend.cc
index 3ea60c5f1..f5f30a30e 100644
--- a/libcef/browser/devtools/devtools_frontend.cc
+++ b/libcef/browser/devtools/devtools_frontend.cc
@@ -77,10 +77,10 @@ static std::string GetFrontendURL() {
                             scheme::kChromeDevToolsHost);
 }
 
-base::DictionaryValue BuildObjectForResponse(const net::HttpResponseHeaders* rh,
-                                             bool success,
-                                             int net_error) {
-  base::DictionaryValue response;
+base::Value::Dict BuildObjectForResponse(const net::HttpResponseHeaders* rh,
+                                         bool success,
+                                         int net_error) {
+  base::Value::Dict response;
   int responseCode = 200;
   if (rh) {
     responseCode = rh->response_code();
@@ -88,18 +88,18 @@ base::DictionaryValue BuildObjectForResponse(const net::HttpResponseHeaders* rh,
     // In case of no headers, assume file:// URL and failed to load
     responseCode = 404;
   }
-  response.SetInteger("statusCode", responseCode);
-  response.SetInteger("netError", net_error);
-  response.SetString("netErrorName", net::ErrorToString(net_error));
+  response.Set("statusCode", responseCode);
+  response.Set("netError", net_error);
+  response.Set("netErrorName", net::ErrorToString(net_error));
 
-  auto headers = std::make_unique<base::DictionaryValue>();
+  base::Value::Dict headers;
   size_t iterator = 0;
   std::string name;
   std::string value;
   // TODO(caseq): this probably needs to handle duplicate header names
   // correctly by folding them.
   while (rh && rh->EnumerateHeaderLines(&iterator, &name, &value)) {
-    headers->SetString(name, value);
+    headers.Set(name, value);
   }
 
   response.Set("headers", std::move(headers));
@@ -222,7 +222,7 @@ class CefDevToolsFrontend::NetworkResourceLoader
   void OnComplete(bool success) override {
     auto response = BuildObjectForResponse(response_headers_.get(), success,
                                            loader_->NetError());
-    bindings_->SendMessageAck(request_id_, std::move(response));
+    bindings_->SendMessageAck(request_id_, base::Value(std::move(response)));
 
     bindings_->loaders_.erase(bindings_->loaders_.find(this));
   }
@@ -473,9 +473,9 @@ void CefDevToolsFrontend::HandleMessageFromDevToolsFrontend(
           std::make_unique<network::WrapperPendingSharedURLLoaderFactory>(
               std::move(pending_remote)));
     } else if (content::HasWebUIScheme(gurl)) {
-      base::DictionaryValue response;
-      response.SetInteger("statusCode", 403);
-      SendMessageAck(request_id, std::move(response));
+      base::Value::Dict response;
+      response.Set("statusCode", 403);
+      SendMessageAck(request_id, base::Value(std::move(response)));
       return;
     } else {
       auto* partition =
diff --git a/libcef/browser/devtools/devtools_manager.cc b/libcef/browser/devtools/devtools_manager.cc
index 900e4b8fa..170f60956 100644
--- a/libcef/browser/devtools/devtools_manager.cc
+++ b/libcef/browser/devtools/devtools_manager.cc
@@ -176,8 +176,8 @@ int CefDevToolsManager::ExecuteDevToolsMethod(
     CefDictionaryValueImpl* impl =
         static_cast<CefDictionaryValueImpl*>(params.get());
     CefValueController::AutoLock lock_scope(impl->controller());
-    return devtools_controller_->ExecuteDevToolsMethod(message_id, method,
-                                                       impl->GetValueUnsafe());
+    return devtools_controller_->ExecuteDevToolsMethod(
+        message_id, method, impl->GetValueUnsafe()->GetIfDict());
   } else {
     return devtools_controller_->ExecuteDevToolsMethod(message_id, method,
                                                        nullptr);
diff --git a/libcef/browser/extension_impl.cc b/libcef/browser/extension_impl.cc
index 61f578738..d1ef91ae5 100644
--- a/libcef/browser/extension_impl.cc
+++ b/libcef/browser/extension_impl.cc
@@ -15,11 +15,9 @@ CefExtensionImpl::CefExtensionImpl(const extensions::Extension* extension,
                                    CefRefPtr<CefExtensionHandler> handler)
     : id_(extension->id()),
       path_(extension->path().value()),
-      manifest_(new CefDictionaryValueImpl(
-          static_cast<base::DictionaryValue*>(
-              new base::Value(extension->manifest()->value()->Clone())),
-          true,
-          true)),
+      manifest_(
+          new CefDictionaryValueImpl(extension->manifest()->value()->Clone(),
+                                     /*read_only=*/true)),
       loader_context_(loader_context),
       handler_(handler) {}
 
diff --git a/libcef/browser/frame_host_impl.cc b/libcef/browser/frame_host_impl.cc
index 88d4d7add..6c7d68c20 100644
--- a/libcef/browser/frame_host_impl.cc
+++ b/libcef/browser/frame_host_impl.cc
@@ -275,11 +275,10 @@ void CefFrameHostImpl::SendProcessMessage(
     // Invalidate the message object immediately by taking the argument list.
     auto argument_list =
         static_cast<CefProcessMessageImpl*>(message.get())->TakeArgumentList();
-
     SendToRenderFrame(
         __FUNCTION__,
         base::BindOnce(
-            [](const CefString& name, base::ListValue argument_list,
+            [](const CefString& name, base::Value::List argument_list,
                const RenderFrameType& render_frame) {
               render_frame->SendMessage(name, std::move(argument_list));
             },
@@ -631,13 +630,12 @@ void CefFrameHostImpl::OnRenderFrameDisconnect() {
 }
 
 void CefFrameHostImpl::SendMessage(const std::string& name,
-                                   base::Value arguments) {
+                                   base::Value::List arguments) {
   if (auto browser = GetBrowserHostBase()) {
     if (auto client = browser->GetClient()) {
-      auto& list_value = base::Value::AsListValue(arguments);
-      CefRefPtr<CefProcessMessageImpl> message(new CefProcessMessageImpl(
-          name, std::move(const_cast<base::ListValue&>(list_value)),
-          /*read_only=*/true));
+      CefRefPtr<CefProcessMessageImpl> message(
+          new CefProcessMessageImpl(name, std::move(arguments),
+                                    /*read_only=*/true));
       browser->GetClient()->OnProcessMessageReceived(
           browser.get(), this, PID_RENDERER, message.get());
     }
diff --git a/libcef/browser/frame_host_impl.h b/libcef/browser/frame_host_impl.h
index a11afdcad..71b234d62 100644
--- a/libcef/browser/frame_host_impl.h
+++ b/libcef/browser/frame_host_impl.h
@@ -135,7 +135,8 @@ class CefFrameHostImpl : public CefFrame, public cef::mojom::BrowserFrame {
                      content::RenderFrameHost* render_frame_host);
 
   // cef::mojom::BrowserFrame methods forwarded from CefBrowserFrame.
-  void SendMessage(const std::string& name, base::Value arguments) override;
+  void SendMessage(const std::string& name,
+                   base::Value::List arguments) override;
   void SendSharedMemoryRegion(const std::string& name,
                               base::ReadOnlySharedMemoryRegion region) override;
   void FrameAttached(mojo::PendingRemote<cef::mojom::RenderFrame> render_frame,
diff --git a/libcef/browser/prefs/pref_helper.cc b/libcef/browser/prefs/pref_helper.cc
index 6857c6853..714882fea 100644
--- a/libcef/browser/prefs/pref_helper.cc
+++ b/libcef/browser/prefs/pref_helper.cc
@@ -51,21 +51,18 @@ CefRefPtr<CefValue> GetPreference(PrefService* pref_service,
   if (!pref) {
     return nullptr;
   }
-  return new CefValueImpl(new base::Value(pref->GetValue()->Clone()));
+  return new CefValueImpl(pref->GetValue()->Clone());
 }
 
 CefRefPtr<CefDictionaryValue> GetAllPreferences(PrefService* pref_service,
                                                 bool include_defaults) {
+  // Returns a DeepCopy of the value.
   base::Value values = pref_service->GetPreferenceValues(
       include_defaults ? PrefService::INCLUDE_DEFAULTS
                        : PrefService::EXCLUDE_DEFAULTS);
 
-  // CefDictionaryValueImpl takes ownership of |values|.
-  return new CefDictionaryValueImpl(
-      base::DictionaryValue::From(
-          base::Value::ToUniquePtrValue(std::move(values)))
-          .release(),
-      true, false);
+  // CefDictionaryValueImpl takes ownership of |values| contents.
+  return new CefDictionaryValueImpl(std::move(values), /*read_only=*/false);
 }
 
 bool CanSetPreference(PrefService* pref_service, const CefString& name) {
diff --git a/libcef/browser/prefs/pref_registrar.cc b/libcef/browser/prefs/pref_registrar.cc
index 44edd168f..70e3044a0 100644
--- a/libcef/browser/prefs/pref_registrar.cc
+++ b/libcef/browser/prefs/pref_registrar.cc
@@ -67,15 +67,12 @@ class CefPreferenceRegistrarImpl : public CefPreferenceRegistrar {
   void RegisterComplexPref(const std::string& name,
                            CefRefPtr<CefValue> default_value) {
     CefValueImpl* impl = static_cast<CefValueImpl*>(default_value.get());
+    auto impl_value = impl->CopyValue();
 
-    CefValueImpl::ScopedLockedValue scoped_locked_value(impl);
-    base::Value* impl_value = impl->GetValueUnsafe();
-
-    // Will make a deep copy of |impl_value|.
-    if (impl_value->type() == base::Value::Type::DICT) {
-      registry_->RegisterDictionaryPref(name, impl_value->Clone());
-    } else if (impl_value->type() == base::Value::Type::LIST) {
-      registry_->RegisterListPref(name, impl_value->Clone());
+    if (impl_value.type() == base::Value::Type::DICT) {
+      registry_->RegisterDictionaryPref(name, std::move(impl_value));
+    } else if (impl_value.type() == base::Value::Type::LIST) {
+      registry_->RegisterListPref(name, std::move(impl_value));
     } else {
       NOTREACHED();
     }
diff --git a/libcef/browser/views/browser_view_impl.cc b/libcef/browser/views/browser_view_impl.cc
index a0cd075ff..74ccef214 100644
--- a/libcef/browser/views/browser_view_impl.cc
+++ b/libcef/browser/views/browser_view_impl.cc
@@ -191,11 +191,11 @@ void CefBrowserViewImpl::Detach() {
   }
 }
 
-void CefBrowserViewImpl::GetDebugInfo(base::DictionaryValue* info,
+void CefBrowserViewImpl::GetDebugInfo(base::Value::Dict* info,
                                       bool include_children) {
   ParentClass::GetDebugInfo(info, include_children);
   if (browser_) {
-    info->SetString("url", browser_->GetMainFrame()->GetURL().ToString());
+    info->Set("url", browser_->GetMainFrame()->GetURL().ToString());
   }
 }
 
diff --git a/libcef/browser/views/browser_view_impl.h b/libcef/browser/views/browser_view_impl.h
index c1b738748..e5d9cc19c 100644
--- a/libcef/browser/views/browser_view_impl.h
+++ b/libcef/browser/views/browser_view_impl.h
@@ -69,8 +69,7 @@ class CefBrowserViewImpl
   // CefViewAdapter methods:
   void Detach() override;
   std::string GetDebugType() override { return "BrowserView"; }
-  void GetDebugInfo(base::DictionaryValue* info,
-                    bool include_children) override;
+  void GetDebugInfo(base::Value::Dict* info, bool include_children) override;
 
   // CefBrowserViewView::Delegate methods:
   void OnBrowserViewAdded() override;
diff --git a/libcef/browser/views/label_button_impl.h b/libcef/browser/views/label_button_impl.h
index f1513a851..40ca62447 100644
--- a/libcef/browser/views/label_button_impl.h
+++ b/libcef/browser/views/label_button_impl.h
@@ -48,10 +48,9 @@ CEF_LABEL_BUTTON_IMPL_T class CefLabelButtonImpl : public CEF_BUTTON_IMPL_D {
   CefRefPtr<CefLabelButton> AsLabelButton() override { return this; }
 
   // CefViewAdapter methods:
-  void GetDebugInfo(base::DictionaryValue* info,
-                    bool include_children) override {
+  void GetDebugInfo(base::Value::Dict* info, bool include_children) override {
     ParentClass::GetDebugInfo(info, include_children);
-    info->SetString("text", ParentClass::root_view()->GetText());
+    info->Set("text", ParentClass::root_view()->GetText());
   }
 
  protected:
diff --git a/libcef/browser/views/panel_impl.h b/libcef/browser/views/panel_impl.h
index 6b47ada88..56083b273 100644
--- a/libcef/browser/views/panel_impl.h
+++ b/libcef/browser/views/panel_impl.h
@@ -49,21 +49,20 @@ CEF_PANEL_IMPL_T class CefPanelImpl : public CEF_VIEW_IMPL_D {
   CefRefPtr<CefPanel> AsPanel() override { return this; }
 
   // CefViewAdapter methods:
-  void GetDebugInfo(base::DictionaryValue* info,
-                    bool include_children) override {
+  void GetDebugInfo(base::Value::Dict* info, bool include_children) override {
     ParentClass::GetDebugInfo(info, include_children);
     if (include_children) {
       const size_t count = ParentClass::content_view()->children().size();
       if (count > 0U) {
-        std::unique_ptr<base::ListValue> children(new base::ListValue());
+        base::Value::List children;
 
         for (size_t i = 0U; i < count; ++i) {
           views::View* view = ParentClass::content_view()->children()[i];
           CefViewAdapter* adapter = CefViewAdapter::GetFor(view);
           if (adapter) {
-            base::DictionaryValue child_info;
+            base::Value::Dict child_info;
             adapter->GetDebugInfo(&child_info, include_children);
-            children->Append(std::move(child_info));
+            children.Append(std::move(child_info));
           }
         }
 
diff --git a/libcef/browser/views/scroll_view_impl.cc b/libcef/browser/views/scroll_view_impl.cc
index fb9a97187..946f1e4dd 100644
--- a/libcef/browser/views/scroll_view_impl.cc
+++ b/libcef/browser/views/scroll_view_impl.cc
@@ -64,16 +64,15 @@ int CefScrollViewImpl::GetVerticalScrollbarWidth() {
   return root_view()->GetScrollBarLayoutWidth();
 }
 
-void CefScrollViewImpl::GetDebugInfo(base::DictionaryValue* info,
+void CefScrollViewImpl::GetDebugInfo(base::Value::Dict* info,
                                      bool include_children) {
   ParentClass::GetDebugInfo(info, include_children);
   if (include_children) {
     views::View* view = root_view()->contents();
     CefViewAdapter* adapter = CefViewAdapter::GetFor(view);
     if (adapter) {
-      std::unique_ptr<base::DictionaryValue> child_info(
-          new base::DictionaryValue());
-      adapter->GetDebugInfo(child_info.get(), include_children);
+      base::Value::Dict child_info;
+      adapter->GetDebugInfo(&child_info, include_children);
       info->Set("content_view", std::move(child_info));
     }
   }
diff --git a/libcef/browser/views/scroll_view_impl.h b/libcef/browser/views/scroll_view_impl.h
index fd5a7c389..47d47cfb2 100644
--- a/libcef/browser/views/scroll_view_impl.h
+++ b/libcef/browser/views/scroll_view_impl.h
@@ -37,8 +37,7 @@ class CefScrollViewImpl
 
   // CefViewAdapter methods:
   std::string GetDebugType() override { return "ScrollView"; }
-  void GetDebugInfo(base::DictionaryValue* info,
-                    bool include_children) override;
+  void GetDebugInfo(base::Value::Dict* info, bool include_children) override;
 
  private:
   // Create a new implementation object.
diff --git a/libcef/browser/views/view_adapter.h b/libcef/browser/views/view_adapter.h
index 39dbf0bbf..958be7f71 100644
--- a/libcef/browser/views/view_adapter.h
+++ b/libcef/browser/views/view_adapter.h
@@ -8,9 +8,7 @@
 
 #include "include/views/cef_view.h"
 
-namespace base {
-class DictionaryValue;
-}
+#include "base/values.h"
 
 namespace views {
 class View;
@@ -48,8 +46,7 @@ class CefViewAdapter {
   virtual std::string GetDebugType() = 0;
 
   // Override this method to provide debug info specific to the View type.
-  virtual void GetDebugInfo(base::DictionaryValue* info,
-                            bool include_children) = 0;
+  virtual void GetDebugInfo(base::Value::Dict* info, bool include_children) = 0;
 
  protected:
   virtual ~CefViewAdapter() {}
diff --git a/libcef/browser/views/view_impl.h b/libcef/browser/views/view_impl.h
index dc3266f54..d9e105d85 100644
--- a/libcef/browser/views/view_impl.h
+++ b/libcef/browser/views/view_impl.h
@@ -343,19 +343,17 @@ CEF_VIEW_IMPL_T class CefViewImpl : public CefViewAdapter, public CefViewClass {
     }
     root_view_ref_ = nullptr;
   }
-  void GetDebugInfo(base::DictionaryValue* info,
-                    bool include_children) override {
-    info->SetString("type", GetDebugType());
-    info->SetInteger("id", root_view()->GetID());
+  void GetDebugInfo(base::Value::Dict* info, bool include_children) override {
+    info->Set("type", GetDebugType());
+    info->Set("id", root_view()->GetID());
 
     // Use GetBounds() because some subclasses (like CefWindowImpl) override it.
     const CefRect& bounds = GetBounds();
-    std::unique_ptr<base::DictionaryValue> bounds_value(
-        new base::DictionaryValue());
-    bounds_value->SetInteger("x", bounds.x);
-    bounds_value->SetInteger("y", bounds.y);
-    bounds_value->SetInteger("width", bounds.width);
-    bounds_value->SetInteger("height", bounds.height);
+    base::Value::Dict bounds_value;
+    bounds_value.Set("x", bounds.x);
+    bounds_value.Set("y", bounds.y);
+    bounds_value.Set("width", bounds.width);
+    bounds_value.Set("height", bounds.height);
     info->Set("bounds", std::move(bounds_value));
   }
 
@@ -454,15 +452,15 @@ CEF_VIEW_IMPL_T CefString CEF_VIEW_IMPL_D::GetTypeString() {
 
 CEF_VIEW_IMPL_T CefString CEF_VIEW_IMPL_D::ToString(bool include_children) {
   CEF_REQUIRE_UIT_RETURN(CefString());
-  std::unique_ptr<base::DictionaryValue> info(new base::DictionaryValue());
+  base::Value::Dict info;
   if (IsValid()) {
-    GetDebugInfo(info.get(), include_children);
+    GetDebugInfo(&info, include_children);
   } else {
-    info->SetString("type", GetDebugType());
+    info.Set("type", GetDebugType());
   }
 
   std::string json_string;
-  base::JSONWriter::WriteWithOptions(*info, 0, &json_string);
+  base::JSONWriter::WriteWithOptions(info, 0, &json_string);
   return json_string;
 }
 
diff --git a/libcef/browser/views/window_impl.cc b/libcef/browser/views/window_impl.cc
index e86de6506..ecd69b44b 100644
--- a/libcef/browser/views/window_impl.cc
+++ b/libcef/browser/views/window_impl.cc
@@ -315,11 +315,11 @@ CefRefPtr<CefOverlayController> CefWindowImpl::AddOverlayView(
   return nullptr;
 }
 
-void CefWindowImpl::GetDebugInfo(base::DictionaryValue* info,
+void CefWindowImpl::GetDebugInfo(base::Value::Dict* info,
                                  bool include_children) {
   ParentClass::GetDebugInfo(info, include_children);
   if (root_view()) {
-    info->SetString("title", root_view()->title());
+    info->Set("title", root_view()->title());
   }
 }
 
diff --git a/libcef/browser/views/window_impl.h b/libcef/browser/views/window_impl.h
index f9557d415..a226d0f88 100644
--- a/libcef/browser/views/window_impl.h
+++ b/libcef/browser/views/window_impl.h
@@ -113,8 +113,7 @@ class CefWindowImpl
 
   // CefViewAdapter methods:
   std::string GetDebugType() override { return "Window"; }
-  void GetDebugInfo(base::DictionaryValue* info,
-                    bool include_children) override;
+  void GetDebugInfo(base::Value::Dict* info, bool include_children) override;
 
   // ui::AcceleratorTarget methods:
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
diff --git a/libcef/common/json_impl.cc b/libcef/common/json_impl.cc
index 13b141ff8..1b5dca73f 100644
--- a/libcef/common/json_impl.cc
+++ b/libcef/common/json_impl.cc
@@ -51,9 +51,7 @@ CefRefPtr<CefValue> CefParseJSON(const void* json,
       base::StringPiece(static_cast<const char*>(json), json_size),
       GetJSONReaderOptions(options));
   if (parse_result) {
-    return new CefValueImpl(
-        base::Value::ToUniquePtrValue(std::move(parse_result.value()))
-            .release());
+    return new CefValueImpl(std::move(parse_result.value()));
   }
   return nullptr;
 }
@@ -68,8 +66,7 @@ CefRefPtr<CefValue> CefParseJSONAndReturnError(
   auto result = base::JSONReader::ReadAndReturnValueWithError(
       json, GetJSONReaderOptions(options));
   if (result.has_value()) {
-    return new CefValueImpl(
-        base::Value::ToUniquePtrValue(std::move(*result)).release());
+    return new CefValueImpl(std::move(*result));
   }
 
   error_msg_out = result.error().message;
diff --git a/libcef/common/mojom/cef.mojom b/libcef/common/mojom/cef.mojom
index 02c83dd1f..ee6fb087f 100644
--- a/libcef/common/mojom/cef.mojom
+++ b/libcef/common/mojom/cef.mojom
@@ -56,7 +56,7 @@ interface RenderFrame {
   FrameDetached();
 
   // Send a message to the render process.
-  SendMessage(string name, mojo_base.mojom.Value arguments);
+  SendMessage(string name, mojo_base.mojom.ListValue arguments);
 
   // Send a shared memory region to the render process.
   SendSharedMemoryRegion(string name, mojo_base.mojom.ReadOnlySharedMemoryRegion region);
@@ -88,7 +88,7 @@ interface RenderFrame {
 // Interface for communicating with a frame in the browser process.
 interface BrowserFrame {
   // Send a message to the browser process.
-  SendMessage(string name, mojo_base.mojom.Value arguments);
+  SendMessage(string name, mojo_base.mojom.ListValue arguments);
 
   // Send a shared memory region to the browser process.
   SendSharedMemoryRegion(string name, mojo_base.mojom.ReadOnlySharedMemoryRegion region);
@@ -117,7 +117,7 @@ struct NewBrowserInfo {
   bool is_popup;
   bool is_windowless;
   bool is_guest_view;
-  mojo_base.mojom.Value? extra_info;
+  mojo_base.mojom.DictionaryValue? extra_info;
 };
 
 // Interface for communicating with browser management in the browser process.
diff --git a/libcef/common/process_message_impl.cc b/libcef/common/process_message_impl.cc
index 19042b013..e90ef83a2 100644
--- a/libcef/common/process_message_impl.cc
+++ b/libcef/common/process_message_impl.cc
@@ -9,7 +9,6 @@
 #include "libcef/common/values_impl.h"
 
 #include "base/logging.h"
-#include "base/memory/ptr_util.h"
 
 // static
 CefRefPtr<CefProcessMessage> CefProcessMessage::Create(const CefString& name) {
@@ -24,25 +23,22 @@ CefProcessMessageImpl::CefProcessMessageImpl(const CefString& name,
 }
 
 CefProcessMessageImpl::CefProcessMessageImpl(const CefString& name,
-                                             base::ListValue arguments,
+                                             base::Value::List arguments,
                                              bool read_only)
     : name_(name) {
   DCHECK(!name_.empty());
 
-  auto new_obj = std::make_unique<base::ListValue>();
-  *new_obj = std::move(arguments);
-  arguments_ =
-      new CefListValueImpl(new_obj.release(), /*will_delete=*/true, read_only);
+  arguments_ = new CefListValueImpl(std::move(arguments), read_only);
 }
 
 CefProcessMessageImpl::~CefProcessMessageImpl() = default;
 
-base::ListValue CefProcessMessageImpl::TakeArgumentList() {
+base::Value::List CefProcessMessageImpl::TakeArgumentList() {
   DCHECK(IsValid());
   CefListValueImpl* value_impl =
       static_cast<CefListValueImpl*>(arguments_.get());
-  auto value = base::WrapUnique(value_impl->CopyOrDetachValue(nullptr));
-  return std::move(*value);
+  auto value = value_impl->CopyOrDetachValue(nullptr);
+  return std::move(value->GetList());
 }
 
 bool CefProcessMessageImpl::IsValid() {
diff --git a/libcef/common/process_message_impl.h b/libcef/common/process_message_impl.h
index 5298e5f27..eadeca189 100644
--- a/libcef/common/process_message_impl.h
+++ b/libcef/common/process_message_impl.h
@@ -8,9 +8,7 @@
 
 #include "include/cef_process_message.h"
 
-namespace base {
-class ListValue;
-}
+#include "base/values.h"
 
 // CefProcessMessage implementation.
 class CefProcessMessageImpl : public CefProcessMessage {
@@ -22,7 +20,7 @@ class CefProcessMessageImpl : public CefProcessMessage {
   // Constructor for creating a new CefListValue that takes ownership of
   // |arguments|.
   CefProcessMessageImpl(const CefString& name,
-                        base::ListValue arguments,
+                        base::Value::List arguments,
                         bool read_only);
 
   CefProcessMessageImpl(const CefProcessMessageImpl&) = delete;
@@ -34,7 +32,7 @@ class CefProcessMessageImpl : public CefProcessMessage {
   // a copy if the argument list is already owned by something else.
   // TODO: Pass by reference instead of ownership if/when Mojo adds support
   // for that.
-  [[nodiscard]] base::ListValue TakeArgumentList();
+  [[nodiscard]] base::Value::List TakeArgumentList();
 
   // CefProcessMessage methods.
   bool IsValid() override;
diff --git a/libcef/common/value_base.h b/libcef/common/value_base.h
index 3eb455b12..ce50ba51c 100644
--- a/libcef/common/value_base.h
+++ b/libcef/common/value_base.h
@@ -297,10 +297,10 @@ class CefValueBase : public CefType, public CefValueController::Object {
   inline bool read_only() const { return read_only_; }
 
   // True if the underlying value has been detached.
-  inline bool detached() { return !controller_.get(); }
+  inline bool detached() const { return !controller_.get(); }
 
   // Returns the controller.
-  inline CefValueController* controller() { return controller_.get(); }
+  inline CefValueController* controller() const { return controller_.get(); }
 
   // Deletes the underlying value.
   void Delete() {
@@ -346,7 +346,7 @@ class CefValueBase : public CefType, public CefValueController::Object {
   }
 
   // Verify that the value is attached.
-  inline bool VerifyAttached() {
+  inline bool VerifyAttached() const {
     if (detached()) {
       // This object should not be accessed after being detached.
       NOTREACHED() << "object accessed after being detached.";
@@ -371,21 +371,27 @@ class CefValueBase : public CefType, public CefValueController::Object {
   virtual void DeleteValue(ValueType* value) { delete value; }
 
   // Returns a mutable reference to the value.
-  inline ValueType* mutable_value() {
+  inline ValueType* mutable_value() const {
     DCHECK(value_);
     DCHECK(!read_only_);
     DCHECK(controller()->locked());
     return value_;
   }
+
   // Returns a const reference to the value.
-  inline const ValueType& const_value() {
+  inline const ValueType& const_value() const {
     DCHECK(value_);
     DCHECK(controller()->locked());
     return *value_;
   }
 
+  // Returns an mutable reference to the value without checking read-only state.
+  inline ValueType* mutable_value_unchecked() const {
+    return const_cast<ValueType*>(&const_value());
+  }
+
   // Verify that the value can be accessed.
-  inline bool VerifyAccess(bool modify) {
+  inline bool VerifyAccess(bool modify) const {
     // The controller must already be locked.
     DCHECK(controller()->locked());
 
diff --git a/libcef/common/values_impl.cc b/libcef/common/values_impl.cc
index 7304c3d02..078410a0d 100644
--- a/libcef/common/values_impl.cc
+++ b/libcef/common/values_impl.cc
@@ -36,7 +36,8 @@ void RemoveEmptyValueDicts(base::Value::Dict& dict) {
 
 // static
 CefRefPtr<CefValue> CefValue::Create() {
-  return new CefValueImpl(new base::Value());
+  // Start with VTYPE_NULL instead of VTYPE_INVALID for backwards compatibility.
+  return new CefValueImpl(base::Value());
 }
 
 // static
@@ -53,25 +54,22 @@ CefRefPtr<CefValue> CefValueImpl::GetOrCreateRefOrCopy(
   }
 
   if (value->is_dict()) {
-    base::DictionaryValue* dict_value =
-        static_cast<base::DictionaryValue*>(value);
     return new CefValueImpl(CefDictionaryValueImpl::GetOrCreateRef(
-        dict_value, parent_value, read_only, controller));
+        value, parent_value, read_only, controller));
   }
 
   if (value->is_list()) {
-    base::ListValue* list_value = static_cast<base::ListValue*>(value);
     return new CefValueImpl(CefListValueImpl::GetOrCreateRef(
-        list_value, parent_value, read_only, controller));
+        value, parent_value, read_only, controller));
   }
 
-  return new CefValueImpl(new base::Value(value->Clone()));
+  return new CefValueImpl(value->Clone());
 }
 
 CefValueImpl::CefValueImpl() {}
 
-CefValueImpl::CefValueImpl(base::Value* value) {
-  SetValue(value);
+CefValueImpl::CefValueImpl(base::Value value) {
+  SetValue(std::move(value));
 }
 
 CefValueImpl::CefValueImpl(CefRefPtr<CefBinaryValue> value)
@@ -85,12 +83,31 @@ CefValueImpl::CefValueImpl(CefRefPtr<CefListValue> value)
 
 CefValueImpl::~CefValueImpl() {}
 
-void CefValueImpl::SetValue(base::Value* value) {
+void CefValueImpl::SetValue(base::Value value) {
   base::AutoLock lock_scope(lock_);
-  SetValueInternal(value);
+  SetValueInternal(absl::make_optional(std::move(value)));
 }
 
-base::Value* CefValueImpl::CopyOrDetachValue(
+base::Value CefValueImpl::CopyValue() {
+  base::AutoLock lock_scope(lock_);
+
+  if (binary_value_) {
+    return static_cast<CefBinaryValueImpl*>(binary_value_.get())->CopyValue();
+  }
+
+  if (dictionary_value_) {
+    return static_cast<CefDictionaryValueImpl*>(dictionary_value_.get())
+        ->CopyValue();
+  }
+
+  if (list_value_) {
+    return static_cast<CefListValueImpl*>(list_value_.get())->CopyValue();
+  }
+
+  return value_->Clone();
+}
+
+std::unique_ptr<base::Value> CefValueImpl::CopyOrDetachValue(
     CefValueController* new_controller) {
   base::AutoLock lock_scope(lock_);
 
@@ -109,7 +126,7 @@ base::Value* CefValueImpl::CopyOrDetachValue(
         ->CopyOrDetachValue(new_controller);
   }
 
-  return new base::Value(value_->Clone());
+  return std::make_unique<base::Value>(value_->Clone());
 }
 
 void CefValueImpl::SwapValue(base::Value* new_value,
@@ -122,12 +139,10 @@ void CefValueImpl::SwapValue(base::Value* new_value,
         new_value, new_parent_value, new_controller);
   } else if (dictionary_value_) {
     dictionary_value_ = CefDictionaryValueImpl::GetOrCreateRef(
-        static_cast<base::DictionaryValue*>(new_value), new_parent_value, false,
-        new_controller);
+        new_value, new_parent_value, false, new_controller);
   } else if (list_value_) {
-    list_value_ = CefListValueImpl::GetOrCreateRef(
-        static_cast<base::ListValue*>(new_value), new_parent_value, false,
-        new_controller);
+    list_value_ = CefListValueImpl::GetOrCreateRef(new_value, new_parent_value,
+                                                   false, new_controller);
   }
 }
 
@@ -249,7 +264,7 @@ CefRefPtr<CefValue> CefValueImpl::Copy() {
     return new CefValueImpl(list_value_->Copy());
   }
   if (value_) {
-    return new CefValueImpl(new base::Value(value_->Clone()));
+    return new CefValueImpl(value_->Clone());
   }
 
   return new CefValueImpl();
@@ -345,52 +360,52 @@ CefRefPtr<CefListValue> CefValueImpl::GetList() {
 }
 
 bool CefValueImpl::SetNull() {
-  SetValue(new base::Value());
+  SetValue(base::Value());
   return true;
 }
 
 bool CefValueImpl::SetBool(bool value) {
-  SetValue(new base::Value(value));
+  SetValue(base::Value(value));
   return true;
 }
 
 bool CefValueImpl::SetInt(int value) {
-  SetValue(new base::Value(value));
+  SetValue(base::Value(value));
   return true;
 }
 
 bool CefValueImpl::SetDouble(double value) {
-  SetValue(new base::Value(value));
+  SetValue(base::Value(value));
   return true;
 }
 
 bool CefValueImpl::SetString(const CefString& value) {
-  SetValue(new base::Value(value.ToString()));
+  SetValue(base::Value(value.ToString()));
   return true;
 }
 
 bool CefValueImpl::SetBinary(CefRefPtr<CefBinaryValue> value) {
   base::AutoLock lock_scope(lock_);
-  SetValueInternal(nullptr);
+  SetValueInternal(absl::nullopt);
   binary_value_ = value;
   return true;
 }
 
 bool CefValueImpl::SetDictionary(CefRefPtr<CefDictionaryValue> value) {
   base::AutoLock lock_scope(lock_);
-  SetValueInternal(nullptr);
+  SetValueInternal(absl::nullopt);
   dictionary_value_ = value;
   return true;
 }
 
 bool CefValueImpl::SetList(CefRefPtr<CefListValue> value) {
   base::AutoLock lock_scope(lock_);
-  SetValueInternal(nullptr);
+  SetValueInternal(absl::nullopt);
   list_value_ = value;
   return true;
 }
 
-void CefValueImpl::SetValueInternal(base::Value* value) {
+void CefValueImpl::SetValueInternal(absl::optional<base::Value> value) {
   lock_.AssertAcquired();
 
   value_.reset(nullptr);
@@ -399,20 +414,21 @@ void CefValueImpl::SetValueInternal(base::Value* value) {
   list_value_ = nullptr;
 
   if (value) {
-    switch (value->type()) {
+    switch ((*value).type()) {
       case base::Value::Type::BINARY:
-        binary_value_ = new CefBinaryValueImpl(value, true);
-        return;
+        binary_value_ = new CefBinaryValueImpl(std::move(*value));
+        break;
       case base::Value::Type::DICTIONARY:
-        dictionary_value_ = new CefDictionaryValueImpl(
-            static_cast<base::DictionaryValue*>(value), true, false);
-        return;
+        dictionary_value_ =
+            new CefDictionaryValueImpl(std::move(*value), /*read_only=*/false);
+        break;
       case base::Value::Type::LIST:
-        list_value_ = new CefListValueImpl(static_cast<base::ListValue*>(value),
-                                           true, false);
-        return;
+        list_value_ =
+            new CefListValueImpl(std::move(*value), /*read_only=*/false);
+        break;
       default:
-        value_.reset(value);
+        value_ = std::make_unique<base::Value>(std::move(*value));
+        break;
     }
   }
 }
@@ -499,41 +515,39 @@ CefRefPtr<CefBinaryValue> CefBinaryValueImpl::GetOrCreateRef(
                                 CefBinaryValueImpl::kReference, controller);
 }
 
+CefBinaryValueImpl::CefBinaryValueImpl(base::Value value)
+    : CefBinaryValueImpl(new base::Value(std::move(value)),
+                         /*will_delete=*/true) {}
+
 CefBinaryValueImpl::CefBinaryValueImpl(base::Value* value, bool will_delete)
-    : CefValueBase<CefBinaryValue, base::Value>(
-          value,
-          nullptr,
-          will_delete ? kOwnerWillDelete : kOwnerNoDelete,
-          true,
-          nullptr) {}
+    : CefBinaryValueImpl(value,
+                         nullptr,
+                         will_delete ? kOwnerWillDelete : kOwnerNoDelete,
+                         nullptr) {}
 
 CefBinaryValueImpl::CefBinaryValueImpl(char* data, size_t data_size)
-    : CefValueBase<CefBinaryValue, base::Value>(
+    : CefBinaryValueImpl(
           new base::Value(std::vector<char>(data, data + data_size)),
           nullptr,
           kOwnerWillDelete,
-          true,
           nullptr) {}
 
-base::Value* CefBinaryValueImpl::CopyValue() {
-  CEF_VALUE_VERIFY_RETURN(false, nullptr);
-  return new base::Value(const_value().Clone());
+base::Value CefBinaryValueImpl::CopyValue() {
+  CEF_VALUE_VERIFY_RETURN(false, base::Value());
+  return const_value().Clone();
 }
 
-base::Value* CefBinaryValueImpl::CopyOrDetachValue(
+std::unique_ptr<base::Value> CefBinaryValueImpl::CopyOrDetachValue(
     CefValueController* new_controller) {
-  base::Value* new_value;
-
   if (!will_delete()) {
     // Copy the value.
-    new_value = CopyValue();
-  } else {
-    // Take ownership of the value.
-    new_value = Detach(new_controller);
+    return std::make_unique<base::Value>(CopyValue());
   }
 
-  DCHECK(new_value);
-  return new_value;
+  // Take ownership of the value.
+  auto value = base::WrapUnique(Detach(new_controller));
+  DCHECK(value.get());
+  return value;
 }
 
 bool CefBinaryValueImpl::IsSameValue(const base::Value* that) {
@@ -546,12 +560,12 @@ bool CefBinaryValueImpl::IsEqualValue(const base::Value* that) {
   return const_value() == *that;
 }
 
-base::Value* CefBinaryValueImpl::GetValueUnsafe() {
+base::Value* CefBinaryValueImpl::GetValueUnsafe() const {
   if (!VerifyAttached()) {
     return nullptr;
   }
   controller()->AssertLockAcquired();
-  return const_cast<base::Value*>(&const_value());
+  return mutable_value_unchecked();
 }
 
 bool CefBinaryValueImpl::IsValid() {
@@ -590,8 +604,7 @@ bool CefBinaryValueImpl::IsEqual(CefRefPtr<CefBinaryValue> that) {
 
 CefRefPtr<CefBinaryValue> CefBinaryValueImpl::Copy() {
   CEF_VALUE_VERIFY_RETURN(false, nullptr);
-  return new CefBinaryValueImpl(new base::Value(const_value().Clone()), nullptr,
-                                CefBinaryValueImpl::kOwnerWillDelete, nullptr);
+  return new CefBinaryValueImpl(const_value().Clone());
 }
 
 size_t CefBinaryValueImpl::GetSize() {
@@ -629,19 +642,20 @@ CefBinaryValueImpl::CefBinaryValueImpl(base::Value* value,
     : CefValueBase<CefBinaryValue, base::Value>(value,
                                                 parent_value,
                                                 value_mode,
-                                                true,
+                                                /*read_only=*/true,
                                                 controller) {}
 
 // CefDictionaryValueImpl implementation.
 
 // static
 CefRefPtr<CefDictionaryValue> CefDictionaryValue::Create() {
-  return new CefDictionaryValueImpl(new base::DictionaryValue(), true, false);
+  return new CefDictionaryValueImpl(base::Value(base::Value::Type::DICT),
+                                    /*read_only=*/false);
 }
 
 // static
 CefRefPtr<CefDictionaryValue> CefDictionaryValueImpl::GetOrCreateRef(
-    base::DictionaryValue* value,
+    base::Value* value,
     void* parent_value,
     bool read_only,
     CefValueController* controller) {
@@ -655,54 +669,59 @@ CefRefPtr<CefDictionaryValue> CefDictionaryValueImpl::GetOrCreateRef(
                                     read_only, controller);
 }
 
-CefDictionaryValueImpl::CefDictionaryValueImpl(base::DictionaryValue* value,
+CefDictionaryValueImpl::CefDictionaryValueImpl(base::Value value,
+                                               bool read_only)
+    : CefDictionaryValueImpl(new base::Value(std::move(value)),
+                             /*will_delete=*/true,
+                             read_only) {}
+
+CefDictionaryValueImpl::CefDictionaryValueImpl(base::Value::Dict value,
+                                               bool read_only)
+    : CefDictionaryValueImpl(base::Value(std::move(value)), read_only) {}
+
+CefDictionaryValueImpl::CefDictionaryValueImpl(base::Value* value,
                                                bool will_delete,
                                                bool read_only)
-    : CefValueBase<CefDictionaryValue, base::DictionaryValue>(
-          value,
-          nullptr,
-          will_delete ? kOwnerWillDelete : kOwnerNoDelete,
-          read_only,
-          nullptr) {}
+    : CefDictionaryValueImpl(value,
+                             nullptr,
+                             will_delete ? kOwnerWillDelete : kOwnerNoDelete,
+                             read_only,
+                             nullptr) {}
 
-base::DictionaryValue* CefDictionaryValueImpl::CopyValue() {
-  CEF_VALUE_VERIFY_RETURN(false, nullptr);
-  return static_cast<base::DictionaryValue*>(
-      new base::Value(const_value().Clone()));
+base::Value CefDictionaryValueImpl::CopyValue() {
+  CEF_VALUE_VERIFY_RETURN(false, base::Value());
+  return const_value().Clone();
 }
 
-base::DictionaryValue* CefDictionaryValueImpl::CopyOrDetachValue(
+std::unique_ptr<base::Value> CefDictionaryValueImpl::CopyOrDetachValue(
     CefValueController* new_controller) {
-  base::DictionaryValue* new_value;
-
   if (!will_delete()) {
     // Copy the value.
-    new_value = CopyValue();
-  } else {
-    // Take ownership of the value.
-    new_value = Detach(new_controller);
+    return std::make_unique<base::Value>(CopyValue());
   }
 
-  DCHECK(new_value);
-  return new_value;
+  // Take ownership of the value.
+  auto value = base::WrapUnique(Detach(new_controller));
+  DCHECK(value.get());
+  return value;
 }
 
-bool CefDictionaryValueImpl::IsSameValue(const base::DictionaryValue* that) {
+bool CefDictionaryValueImpl::IsSameValue(const base::Value* that) {
   CEF_VALUE_VERIFY_RETURN(false, false);
   return (&const_value() == that);
 }
 
-bool CefDictionaryValueImpl::IsEqualValue(const base::DictionaryValue* that) {
+bool CefDictionaryValueImpl::IsEqualValue(const base::Value* that) {
   CEF_VALUE_VERIFY_RETURN(false, false);
   return const_value() == *that;
 }
 
-base::DictionaryValue* CefDictionaryValueImpl::GetValueUnsafe() {
+base::Value* CefDictionaryValueImpl::GetValueUnsafe() const {
   if (!VerifyAttached()) {
     return nullptr;
   }
   controller()->AssertLockAcquired();
-  return const_cast<base::DictionaryValue*>(&const_value());
+  return mutable_value_unchecked();
 }
 
 bool CefDictionaryValueImpl::IsValid() {
@@ -747,19 +766,17 @@ CefRefPtr<CefDictionaryValue> CefDictionaryValueImpl::Copy(
     bool exclude_empty_children) {
   CEF_VALUE_VERIFY_RETURN(false, nullptr);
 
-  base::DictionaryValue* value = static_cast<base::DictionaryValue*>(
-      new base::Value(const_value().Clone()));
+  auto value = const_value().Clone();
   if (exclude_empty_children) {
-    RemoveEmptyValueDicts(value->GetDict());
+    RemoveEmptyValueDicts(value.GetDict());
   }
 
-  return new CefDictionaryValueImpl(
-      value, nullptr, CefDictionaryValueImpl::kOwnerWillDelete, false, nullptr);
+  return new CefDictionaryValueImpl(std::move(value), /*read_only=*/false);
 }
 
 size_t CefDictionaryValueImpl::GetSize() {
   CEF_VALUE_VERIFY_RETURN(false, 0);
-  return const_value().DictSize();
+  return const_value().GetDict().size();
 }
 
 bool CefDictionaryValueImpl::Clear() {
@@ -774,7 +791,7 @@ bool CefDictionaryValueImpl::Clear() {
 
 bool CefDictionaryValueImpl::HasKey(const CefString& key) {
   CEF_VALUE_VERIFY_RETURN(false, 0);
-  return const_value().FindKey(base::StringPiece(key));
+  return const_value().GetDict().contains(base::StringPiece(key));
 }
 
 bool CefDictionaryValueImpl::GetKeys(KeyList& keys) {
@@ -795,7 +812,8 @@ bool CefDictionaryValueImpl::Remove(const CefString& key) {
 CefValueType CefDictionaryValueImpl::GetType(const CefString& key) {
   CEF_VALUE_VERIFY_RETURN(false, VTYPE_INVALID);
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value) {
     switch (value->type()) {
       case base::Value::Type::NONE:
@@ -823,12 +841,12 @@ CefValueType CefDictionaryValueImpl::GetType(const CefString& key) {
 CefRefPtr<CefValue> CefDictionaryValueImpl::GetValue(const CefString& key) {
   CEF_VALUE_VERIFY_RETURN(false, nullptr);
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value) {
-    return CefValueImpl::GetOrCreateRefOrCopy(
-        const_cast<base::Value*>(value),
-        const_cast<base::DictionaryValue*>(&const_value()), read_only(),
-        controller());
+    return CefValueImpl::GetOrCreateRefOrCopy(const_cast<base::Value*>(value),
+                                              mutable_value_unchecked(),
+                                              read_only(), controller());
   }
 
   return nullptr;
@@ -839,7 +857,8 @@ bool CefDictionaryValueImpl::GetBool(const CefString& key) {
 
   bool ret_value = false;
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value && value->is_bool()) {
     ret_value = value->GetBool();
   }
@@ -852,7 +871,8 @@ int CefDictionaryValueImpl::GetInt(const CefString& key) {
 
   int ret_value = 0;
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value && value->is_int()) {
     ret_value = value->GetInt();
   }
@@ -865,7 +885,8 @@ double CefDictionaryValueImpl::GetDouble(const CefString& key) {
 
   double ret_value = 0;
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value && value->is_double()) {
     ret_value = value->GetDouble();
   }
@@ -878,7 +899,8 @@ CefString CefDictionaryValueImpl::GetString(const CefString& key) {
 
   std::string ret_value;
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value && value->is_string()) {
     ret_value = value->GetString();
   }
@@ -890,12 +912,12 @@ CefRefPtr<CefBinaryValue> CefDictionaryValueImpl::GetBinary(
     const CefString& key) {
   CEF_VALUE_VERIFY_RETURN(false, nullptr);
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value && value->is_blob()) {
     base::Value* binary_value = const_cast<base::Value*>(value);
     return CefBinaryValueImpl::GetOrCreateRef(
-        binary_value, const_cast<base::DictionaryValue*>(&const_value()),
-        controller());
+        binary_value, mutable_value_unchecked(), controller());
   }
 
   return nullptr;
@@ -905,13 +927,12 @@ CefRefPtr<CefDictionaryValue> CefDictionaryValueImpl::GetDictionary(
     const CefString& key) {
   CEF_VALUE_VERIFY_RETURN(false, nullptr);
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value && value->is_dict()) {
-    base::DictionaryValue* dict_value =
-        static_cast<base::DictionaryValue*>(const_cast<base::Value*>(value));
+    base::Value* dict_value = const_cast<base::Value*>(value);
     return CefDictionaryValueImpl::GetOrCreateRef(
-        dict_value, const_cast<base::DictionaryValue*>(&const_value()),
-        read_only(), controller());
+        dict_value, mutable_value_unchecked(), read_only(), controller());
   }
 
   return nullptr;
@@ -920,13 +941,12 @@ CefRefPtr<CefDictionaryValue> CefDictionaryValueImpl::GetDictionary(
 CefRefPtr<CefListValue> CefDictionaryValueImpl::GetList(const CefString& key) {
   CEF_VALUE_VERIFY_RETURN(false, nullptr);
 
-  const base::Value* value = const_value().FindKey(base::StringPiece(key));
+  const base::Value* value =
+      const_value().GetDict().Find(base::StringPiece(key));
   if (value && value->is_list()) {
-    base::ListValue* list_value =
-        static_cast<base::ListValue*>(const_cast<base::Value*>(value));
+    base::Value* list_value = const_cast<base::Value*>(value);
     return CefListValueImpl::GetOrCreateRef(
-        list_value, const_cast<base::DictionaryValue*>(&const_value()),
-        read_only(), controller());
+        list_value, mutable_value_unchecked(), read_only(), controller());
   }
 
   return nullptr;
@@ -939,40 +959,40 @@ bool CefDictionaryValueImpl::SetValue(const CefString& key,
   CefValueImpl* impl = static_cast<CefValueImpl*>(value.get());
   DCHECK(impl);
 
-  base::Value* new_value = impl->CopyOrDetachValue(controller());
-  base::Value* actual_value = SetInternal(key, new_value);
+  base::Value* actual_value =
+      SetInternal(key, impl->CopyOrDetachValue(controller()));
   impl->SwapValue(actual_value, mutable_value(), controller());
   return true;
 }
 
 bool CefDictionaryValueImpl::SetNull(const CefString& key) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(key, new base::Value());
+  SetInternal(key, std::make_unique<base::Value>());
   return true;
 }
 
 bool CefDictionaryValueImpl::SetBool(const CefString& key, bool value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(key, new base::Value(value));
+  SetInternal(key, std::make_unique<base::Value>(value));
   return true;
 }
 
 bool CefDictionaryValueImpl::SetInt(const CefString& key, int value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(key, new base::Value(value));
+  SetInternal(key, std::make_unique<base::Value>(value));
   return true;
 }
 
 bool CefDictionaryValueImpl::SetDouble(const CefString& key, double value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(key, new base::Value(value));
+  SetInternal(key, std::make_unique<base::Value>(value));
   return true;
 }
 
 bool CefDictionaryValueImpl::SetString(const CefString& key,
                                        const CefString& value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(key, new base::Value(value.ToString()));
+  SetInternal(key, std::make_unique<base::Value>(value.ToString()));
   return true;
 }
 
@@ -1018,14 +1038,14 @@ bool CefDictionaryValueImpl::RemoveInternal(const CefString& key) {
   // retrieve the actual Value pointer as it current exists first, for later
   // comparison purposes.
   const base::Value* actual_value =
-      const_value().FindKey(base::StringPiece(key));
+      const_value().GetDict().Find(base::StringPiece(key));
   if (!actual_value) {
     return false;
   }
 
   // |actual_value| is no longer valid after this call.
   absl::optional<base::Value> out_value =
-      mutable_value()->ExtractKey(base::StringPiece(key));
+      mutable_value()->GetDict().Extract(base::StringPiece(key));
   if (!out_value.has_value()) {
     return false;
   }
@@ -1041,10 +1061,10 @@ bool CefDictionaryValueImpl::RemoveInternal(const CefString& key) {
   return true;
 }
 
-base::Value* CefDictionaryValueImpl::SetInternal(const CefString& key,
-                                                 base::Value* value) {
+base::Value* CefDictionaryValueImpl::SetInternal(
+    const CefString& key,
+    std::unique_ptr<base::Value> value) {
   DCHECK(value);
-  std::unique_ptr<base::Value> valueObj(value);
 
   RemoveInternal(key);
 
@@ -1057,32 +1077,35 @@ base::Value* CefDictionaryValueImpl::SetInternal(const CefString& key,
 
   // |value| will be deleted when this method returns. Update the controller to
   // reference |actual_value| instead.
-  controller()->Swap(value, actual_value);
+  controller()->Swap(value.get(), actual_value);
 
   return actual_value;
 }
 
-CefDictionaryValueImpl::CefDictionaryValueImpl(base::DictionaryValue* value,
+CefDictionaryValueImpl::CefDictionaryValueImpl(base::Value* value,
                                                void* parent_value,
                                                ValueMode value_mode,
                                                bool read_only,
                                                CefValueController* controller)
-    : CefValueBase<CefDictionaryValue, base::DictionaryValue>(value,
-                                                              parent_value,
-                                                              value_mode,
-                                                              read_only,
-                                                              controller) {}
+    : CefValueBase<CefDictionaryValue, base::Value>(value,
+                                                    parent_value,
+                                                    value_mode,
+                                                    read_only,
+                                                    controller) {
+  DCHECK(value->is_dict());
+}
 
 // CefListValueImpl implementation.
 
 // static
 CefRefPtr<CefListValue> CefListValue::Create() {
-  return new CefListValueImpl(new base::ListValue(), true, false);
+  return new CefListValueImpl(base::Value(base::Value::Type::LIST),
+                              /*read_only=*/false);
 }
 
 // static
 CefRefPtr<CefListValue> CefListValueImpl::GetOrCreateRef(
-    base::ListValue* value,
+    base::Value* value,
     void* parent_value,
     bool read_only,
     CefValueController* controller) {
@@ -1095,53 +1118,57 @@ CefRefPtr<CefListValue> CefListValueImpl::GetOrCreateRef(
                               read_only, controller);
 }
 
-CefListValueImpl::CefListValueImpl(base::ListValue* value,
+CefListValueImpl::CefListValueImpl(base::Value value, bool read_only)
+    : CefListValueImpl(new base::Value(std::move(value)),
+                       /*will_delete=*/true,
+                       read_only) {}
+
+CefListValueImpl::CefListValueImpl(base::Value::List value, bool read_only)
+    : CefListValueImpl(base::Value(std::move(value)), read_only) {}
+
+CefListValueImpl::CefListValueImpl(base::Value* value,
                                    bool will_delete,
                                    bool read_only)
-    : CefValueBase<CefListValue, base::ListValue>(
-          value,
-          nullptr,
-          will_delete ? kOwnerWillDelete : kOwnerNoDelete,
-          read_only,
-          nullptr) {}
+    : CefListValueImpl(value,
+                       nullptr,
+                       will_delete ? kOwnerWillDelete : kOwnerNoDelete,
+                       read_only,
+                       nullptr) {}
 
-base::ListValue* CefListValueImpl::CopyValue() {
-  CEF_VALUE_VERIFY_RETURN(false, nullptr);
-  return static_cast<base::ListValue*>(new base::Value(const_value().Clone()));
+base::Value CefListValueImpl::CopyValue() {
+  CEF_VALUE_VERIFY_RETURN(false, base::Value());
+  return const_value().Clone();
 }
 
-base::ListValue* CefListValueImpl::CopyOrDetachValue(
+std::unique_ptr<base::Value> CefListValueImpl::CopyOrDetachValue(
     CefValueController* new_controller) {
-  base::ListValue* new_value;
-
   if (!will_delete()) {
     // Copy the value.
-    new_value = CopyValue();
-  } else {
-    // Take ownership of the value.
-    new_value = Detach(new_controller);
+    return std::make_unique<base::Value>(CopyValue());
   }
 
-  DCHECK(new_value);
-  return new_value;
+  // Take ownership of the value.
+  auto value = base::WrapUnique(Detach(new_controller));
+  DCHECK(value.get());
+  return value;
 }
 
-bool CefListValueImpl::IsSameValue(const base::ListValue* that) {
+bool CefListValueImpl::IsSameValue(const base::Value* that) {
   CEF_VALUE_VERIFY_RETURN(false, false);
   return (&const_value() == that);
 }
 
-bool CefListValueImpl::IsEqualValue(const base::ListValue* that) {
+bool CefListValueImpl::IsEqualValue(const base::Value* that) {
   CEF_VALUE_VERIFY_RETURN(false, false);
   return const_value() == *that;
 }
 
-base::ListValue* CefListValueImpl::GetValueUnsafe() {
+base::Value* CefListValueImpl::GetValueUnsafe() const {
   if (!VerifyAttached()) {
     return nullptr;
   }
   controller()->AssertLockAcquired();
-  return const_cast<base::ListValue*>(&const_value());
+  return mutable_value_unchecked();
 }
 
 bool CefListValueImpl::IsValid() {
@@ -1185,9 +1212,7 @@ bool CefListValueImpl::IsEqual(CefRefPtr<CefListValue> that) {
 CefRefPtr<CefListValue> CefListValueImpl::Copy() {
   CEF_VALUE_VERIFY_RETURN(false, nullptr);
 
-  return new CefListValueImpl(
-      static_cast<base::ListValue*>(new base::Value(const_value().Clone())),
-      nullptr, CefListValueImpl::kOwnerWillDelete, false, nullptr);
+  return new CefListValueImpl(const_value().Clone(), /*read_only=*/false);
 }
 
 bool CefListValueImpl::SetSize(size_t size) {
@@ -1205,7 +1230,7 @@ bool CefListValueImpl::SetSize(size_t size) {
     // for background.
     auto& list = mutable_value()->GetList();
     while (list.size() < size) {
-      mutable_value()->Append(base::Value());
+      list.Append(base::Value());
     }
   }
   return true;
@@ -1266,10 +1291,9 @@ CefRefPtr<CefValue> CefListValueImpl::GetValue(size_t index) {
   const auto& list = const_value().GetList();
   if (index < list.size()) {
     const base::Value& value = list[index];
-    return CefValueImpl::GetOrCreateRefOrCopy(
-        const_cast<base::Value*>(&value),
-        const_cast<base::ListValue*>(&const_value()), read_only(),
-        controller());
+    return CefValueImpl::GetOrCreateRefOrCopy(const_cast<base::Value*>(&value),
+                                              mutable_value_unchecked(),
+                                              read_only(), controller());
   }
 
   return nullptr;
@@ -1340,12 +1364,10 @@ CefRefPtr<CefBinaryValue> CefListValueImpl::GetBinary(size_t index) {
 
   const auto& list = const_value().GetList();
   if (index < list.size()) {
-    const base::Value& value = list[index];
+    base::Value& value = const_cast<base::Value&>(list[index]);
     if (value.is_blob()) {
-      base::Value* binary_value = const_cast<base::Value*>(&value);
       return CefBinaryValueImpl::GetOrCreateRef(
-          binary_value, const_cast<base::ListValue*>(&const_value()),
-          controller());
+          &value, mutable_value_unchecked(), controller());
     }
   }
 
@@ -1357,13 +1379,10 @@ CefRefPtr<CefDictionaryValue> CefListValueImpl::GetDictionary(size_t index) {
 
   const auto& list = const_value().GetList();
   if (index < list.size()) {
-    const base::Value& value = list[index];
+    base::Value& value = const_cast<base::Value&>(list[index]);
     if (value.is_dict()) {
-      base::DictionaryValue* dict_value =
-          static_cast<base::DictionaryValue*>(const_cast<base::Value*>(&value));
       return CefDictionaryValueImpl::GetOrCreateRef(
-          dict_value, const_cast<base::ListValue*>(&const_value()), read_only(),
-          controller());
+          &value, mutable_value_unchecked(), read_only(), controller());
     }
   }
 
@@ -1375,13 +1394,10 @@ CefRefPtr<CefListValue> CefListValueImpl::GetList(size_t index) {
 
   const auto& list = const_value().GetList();
   if (index < list.size()) {
-    const base::Value& value = list[index];
+    base::Value& value = const_cast<base::Value&>(list[index]);
     if (value.is_list()) {
-      base::ListValue* list_value =
-          static_cast<base::ListValue*>(const_cast<base::Value*>(&value));
-      return CefListValueImpl::GetOrCreateRef(
-          list_value, const_cast<base::ListValue*>(&const_value()), read_only(),
-          controller());
+      return CefListValueImpl::GetOrCreateRef(&value, mutable_value_unchecked(),
+                                              read_only(), controller());
     }
   }
 
@@ -1394,39 +1410,39 @@ bool CefListValueImpl::SetValue(size_t index, CefRefPtr<CefValue> value) {
   CefValueImpl* impl = static_cast<CefValueImpl*>(value.get());
   DCHECK(impl);
 
-  base::Value* new_value = impl->CopyOrDetachValue(controller());
-  base::Value* actual_value = SetInternal(index, new_value);
+  base::Value* actual_value =
+      SetInternal(index, impl->CopyOrDetachValue(controller()));
   impl->SwapValue(actual_value, mutable_value(), controller());
   return true;
 }
 
 bool CefListValueImpl::SetNull(size_t index) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(index, new base::Value());
+  SetInternal(index, std::make_unique<base::Value>());
   return true;
 }
 
 bool CefListValueImpl::SetBool(size_t index, bool value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(index, new base::Value(value));
+  SetInternal(index, std::make_unique<base::Value>(value));
   return true;
 }
 
 bool CefListValueImpl::SetInt(size_t index, int value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(index, new base::Value(value));
+  SetInternal(index, std::make_unique<base::Value>(value));
   return true;
 }
 
 bool CefListValueImpl::SetDouble(size_t index, double value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(index, new base::Value(value));
+  SetInternal(index, std::make_unique<base::Value>(value));
   return true;
 }
 
 bool CefListValueImpl::SetString(size_t index, const CefString& value) {
   CEF_VALUE_VERIFY_RETURN(true, false);
-  SetInternal(index, new base::Value(value.ToString()));
+  SetInternal(index, std::make_unique<base::Value>(value.ToString()));
   return true;
 }
 
@@ -1491,9 +1507,9 @@ bool CefListValueImpl::RemoveInternal(size_t index) {
   return true;
 }
 
-base::Value* CefListValueImpl::SetInternal(size_t index, base::Value* value) {
+base::Value* CefListValueImpl::SetInternal(size_t index,
+                                           std::unique_ptr<base::Value> value) {
   DCHECK(value);
-  std::unique_ptr<base::Value> valueObj(value);
 
   auto& list = mutable_value()->GetList();
   if (RemoveInternal(index)) {
@@ -1505,7 +1521,7 @@ base::Value* CefListValueImpl::SetInternal(size_t index, base::Value* value) {
       // TODO: This approach seems inefficient. See
       // https://crbug.com/1187066#c17 for background.
       while (list.size() <= index) {
-        mutable_value()->Append(base::Value());
+        list.Append(base::Value());
       }
     }
     list[index] = std::move(*value);
@@ -1519,18 +1535,20 @@ base::Value* CefListValueImpl::SetInternal(size_t index, base::Value* value) {
 
   // |value| will be deleted when this method returns. Update the controller to
   // reference |actual_value| instead.
-  controller()->Swap(value, const_cast<base::Value*>(&actual_value));
+  controller()->Swap(value.get(), const_cast<base::Value*>(&actual_value));
 
   return const_cast<base::Value*>(&actual_value);
 }
 
-CefListValueImpl::CefListValueImpl(base::ListValue* value,
+CefListValueImpl::CefListValueImpl(base::Value* value,
                                    void* parent_value,
                                    ValueMode value_mode,
                                    bool read_only,
                                    CefValueController* controller)
-    : CefValueBase<CefListValue, base::ListValue>(value,
-                                                  parent_value,
-                                                  value_mode,
-                                                  read_only,
-                                                  controller) {}
+    : CefValueBase<CefListValue, base::Value>(value,
+                                              parent_value,
+                                              value_mode,
+                                              read_only,
+                                              controller) {
+  DCHECK(value->is_list());
+}
diff --git a/libcef/common/values_impl.h b/libcef/common/values_impl.h
index 841db9474..db43299ae 100644
--- a/libcef/common/values_impl.h
+++ b/libcef/common/values_impl.h
@@ -6,6 +6,7 @@
 #define CEF_LIBCEF_COMMON_VALUES_IMPL_H_
 #pragma once
 
+#include <memory>
 #include <vector>
 
 #include "include/cef_values.h"
@@ -28,7 +29,7 @@ class CefValueImpl : public CefValue {
 
   // Take ownership of |value|. Do not pass in a value owned by something else
   // (use GetOrCreateRefOrCopy instead).
-  explicit CefValueImpl(base::Value* value);
+  explicit CefValueImpl(base::Value value);
 
   // Keep a reference to |value|.
   explicit CefValueImpl(CefRefPtr<CefBinaryValue> value);
@@ -42,19 +43,23 @@ class CefValueImpl : public CefValue {
 
   // Take ownership of |value|. Do not pass in a value owned by something else
   // (use GetOrCreateRefOrCopy or Set*() instead).
-  void SetValue(base::Value* value);
+  void SetValue(base::Value value);
+
+  // Return a copy of the value.
+  [[nodiscard]] base::Value CopyValue();
 
   // Copy a simple value or transfer ownership of a complex value. If ownership
   // of the value is tranferred then this object's internal reference to the
   // value will be updated and remain valid. base::Value now uses move semantics
   // so we need to perform the copy and swap in two steps.
-  base::Value* CopyOrDetachValue(CefValueController* new_controller);
+  [[nodiscard]] std::unique_ptr<base::Value> CopyOrDetachValue(
+      CefValueController* new_controller);
   void SwapValue(base::Value* new_value,
                  void* new_parent_value,
                  CefValueController* new_controller);
 
   // Returns a reference to the underlying data. Access must be protected by
-  // calling AcquireLock/ReleaseLock.
+  // calling AcquireLock/ReleaseLock (e.g. use ScopedLockedValue).
   base::Value* GetValueUnsafe() const;
 
   // CefValue methods.
@@ -101,7 +106,7 @@ class CefValueImpl : public CefValue {
   };
 
  private:
-  void SetValueInternal(base::Value* value);
+  void SetValueInternal(absl::optional<base::Value> value);
 
   // Returns the controller for the current value, if any.
   CefValueController* GetValueController() const;
@@ -133,6 +138,10 @@ class CefBinaryValueImpl : public CefValueBase<CefBinaryValue, base::Value> {
       void* parent_value,
       CefValueController* controller);
 
+  // Take ownership of |value|. Do not pass in a value owned by something else
+  // (use GetOrCreateRef or constructor variant with |will_delete| argument).
+  explicit CefBinaryValueImpl(base::Value value);
+
   // Reference an existing value (set |will_delete| to false) or take ownership
   // of an existing value (set |will_delete| to true). When referencing an
   // existing value you must explicitly call Detach(nullptr) when |value| is no
@@ -148,11 +157,11 @@ class CefBinaryValueImpl : public CefValueBase<CefBinaryValue, base::Value> {
   CefBinaryValueImpl& operator=(const CefBinaryValueImpl&) = delete;
 
   // Return a copy of the value.
-  [[nodiscard]] base::Value* CopyValue();
+  [[nodiscard]] base::Value CopyValue();
 
   // If this value is a reference then return a copy. Otherwise, detach and
   // transfer ownership of the value.
-  [[nodiscard]] base::Value* CopyOrDetachValue(
+  [[nodiscard]] std::unique_ptr<base::Value> CopyOrDetachValue(
       CefValueController* new_controller);
 
   bool IsSameValue(const base::Value* that);
@@ -160,7 +169,7 @@ class CefBinaryValueImpl : public CefValueBase<CefBinaryValue, base::Value> {
 
   // Returns the underlying value. Access must be protected by calling
   // lock/unlock on the controller.
-  base::Value* GetValueUnsafe();
+  base::Value* GetValueUnsafe() const;
 
   // CefBinaryValue methods.
   bool IsValid() override;
@@ -182,42 +191,45 @@ class CefBinaryValueImpl : public CefValueBase<CefBinaryValue, base::Value> {
 
 // CefDictionaryValue implementation
 class CefDictionaryValueImpl
-    : public CefValueBase<CefDictionaryValue, base::DictionaryValue> {
+    : public CefValueBase<CefDictionaryValue, base::Value> {
  public:
   // Get or create a reference value.
   static CefRefPtr<CefDictionaryValue> GetOrCreateRef(
-      base::DictionaryValue* value,
+      base::Value* value,
       void* parent_value,
       bool read_only,
       CefValueController* controller);
 
+  // Take ownership of |value|. Do not pass in a value owned by something else
+  // (use GetOrCreateRef or constructor variant with |will_delete| argument).
+  CefDictionaryValueImpl(base::Value value, bool read_only);
+  CefDictionaryValueImpl(base::Value::Dict value, bool read_only);
+
   // Reference an existing value (set |will_delete| to false) or take ownership
   // of an existing value (set |will_delete| to true). When referencing an
   // existing value you must explicitly call Detach(nullptr) when |value| is no
   // longer valid. Use GetOrCreateRef instead of this constructor if |value| is
   // owned by some other object and you do not plan to explicitly call
   // Detach(nullptr).
-  CefDictionaryValueImpl(base::DictionaryValue* value,
-                         bool will_delete,
-                         bool read_only);
+  CefDictionaryValueImpl(base::Value* value, bool will_delete, bool read_only);
 
   CefDictionaryValueImpl(const CefDictionaryValueImpl&) = delete;
   CefDictionaryValueImpl& operator=(const CefDictionaryValueImpl&) = delete;
 
   // Return a copy of the value.
-  [[nodiscard]] base::DictionaryValue* CopyValue();
+  [[nodiscard]] base::Value CopyValue();
 
   // If this value is a reference then return a copy. Otherwise, detach and
   // transfer ownership of the value.
-  [[nodiscard]] base::DictionaryValue* CopyOrDetachValue(
+  [[nodiscard]] std::unique_ptr<base::Value> CopyOrDetachValue(
       CefValueController* new_controller);
 
-  bool IsSameValue(const base::DictionaryValue* that);
-  bool IsEqualValue(const base::DictionaryValue* that);
+  bool IsSameValue(const base::Value* that);
+  bool IsEqualValue(const base::Value* that);
 
   // Returns the underlying value. Access must be protected by calling
   // lock/unlock on the controller.
-  base::DictionaryValue* GetValueUnsafe();
+  base::Value* GetValueUnsafe() const;
 
   // CefDictionaryValue methods.
   bool IsValid() override;
@@ -254,50 +266,56 @@ class CefDictionaryValueImpl
 
  private:
   // See the CefValueBase constructor for usage.
-  CefDictionaryValueImpl(base::DictionaryValue* value,
+  CefDictionaryValueImpl(base::Value* value,
                          void* parent_value,
                          ValueMode value_mode,
                          bool read_only,
                          CefValueController* controller);
 
   bool RemoveInternal(const CefString& key);
-  base::Value* SetInternal(const CefString& key, base::Value* value);
+  base::Value* SetInternal(const CefString& key,
+                           std::unique_ptr<base::Value> value);
 };
 
 // CefListValue implementation
-class CefListValueImpl : public CefValueBase<CefListValue, base::ListValue> {
+class CefListValueImpl : public CefValueBase<CefListValue, base::Value> {
  public:
   // Get or create a reference value.
-  static CefRefPtr<CefListValue> GetOrCreateRef(base::ListValue* value,
+  static CefRefPtr<CefListValue> GetOrCreateRef(base::Value* value,
                                                 void* parent_value,
                                                 bool read_only,
                                                 CefValueController* controller);
 
+  // Take ownership of |value|. Do not pass in a value owned by something else
+  // (use GetOrCreateRef or constructor variant with |will_delete| argument).
+  CefListValueImpl(base::Value value, bool read_only);
+  CefListValueImpl(base::Value::List value, bool read_only);
+
   // Reference an existing value (set |will_delete| to false) or take ownership
   // of an existing value (set |will_delete| to true). When referencing an
   // existing value you must explicitly call Detach(nullptr) when |value| is no
   // longer valid. Use GetOrCreateRef instead of this constructor if |value| is
   // owned by some other object and you do not plan to explicitly call
   // Detach(nullptr).
-  CefListValueImpl(base::ListValue* value, bool will_delete, bool read_only);
+  CefListValueImpl(base::Value* value, bool will_delete, bool read_only);
 
   CefListValueImpl(const CefListValueImpl&) = delete;
   CefListValueImpl& operator=(const CefListValueImpl&) = delete;
 
   // Return a copy of the value.
-  [[nodiscard]] base::ListValue* CopyValue();
+  [[nodiscard]] base::Value CopyValue();
 
   // If this value is a reference then return a copy. Otherwise, detach and
   // transfer ownership of the value.
-  [[nodiscard]] base::ListValue* CopyOrDetachValue(
+  [[nodiscard]] std::unique_ptr<base::Value> CopyOrDetachValue(
       CefValueController* new_controller);
 
-  bool IsSameValue(const base::ListValue* that);
-  bool IsEqualValue(const base::ListValue* that);
+  bool IsSameValue(const base::Value* that);
+  bool IsEqualValue(const base::Value* that);
 
   // Returns the underlying value. Access must be protected by calling
   // lock/unlock on the controller.
-  base::ListValue* GetValueUnsafe();
+  base::Value* GetValueUnsafe() const;
 
   // CefListValue methods.
   bool IsValid() override;
@@ -332,14 +350,14 @@ class CefListValueImpl : public CefValueBase<CefListValue, base::ListValue> {
 
  private:
   // See the CefValueBase constructor for usage.
-  CefListValueImpl(base::ListValue* value,
+  CefListValueImpl(base::Value* value,
                    void* parent_value,
                    ValueMode value_mode,
                    bool read_only,
                    CefValueController* controller);
 
   bool RemoveInternal(size_t index);
-  base::Value* SetInternal(size_t index, base::Value* value);
+  base::Value* SetInternal(size_t index, std::unique_ptr<base::Value> value);
 };
 
 #endif  // CEF_LIBCEF_COMMON_VALUES_IMPL_H_
diff --git a/libcef/renderer/extensions/print_render_frame_helper_delegate.cc b/libcef/renderer/extensions/print_render_frame_helper_delegate.cc
index 5452ceaad..690ee3d7d 100644
--- a/libcef/renderer/extensions/print_render_frame_helper_delegate.cc
+++ b/libcef/renderer/extensions/print_render_frame_helper_delegate.cc
@@ -61,9 +61,9 @@ bool CefPrintRenderFrameHelperDelegate::OverridePrint(
     // instructs the PDF plugin to print. This is to make window.print() on a
     // PDF plugin document correctly print the PDF. See
     // https://crbug.com/448720.
-    base::DictionaryValue message;
-    message.SetString("type", "print");
-    post_message_support->PostMessageFromValue(message);
+    base::Value::Dict message;
+    message.Set("type", "print");
+    post_message_support->PostMessageFromValue(base::Value(std::move(message)));
     return true;
   }
   return false;
diff --git a/libcef/renderer/frame_impl.cc b/libcef/renderer/frame_impl.cc
index d1b9ebac1..18e1ddd0c 100644
--- a/libcef/renderer/frame_impl.cc
+++ b/libcef/renderer/frame_impl.cc
@@ -290,7 +290,7 @@ void CefFrameImpl::SendProcessMessage(CefProcessId target_process,
     SendToBrowserFrame(
         __FUNCTION__,
         base::BindOnce(
-            [](const CefString& name, base::ListValue argument_list,
+            [](const CefString& name, base::Value::List argument_list,
                const BrowserFrameType& render_frame) {
               render_frame->SendMessage(name, std::move(argument_list));
             },
@@ -732,13 +732,13 @@ void CefFrameImpl::FrameDetached() {
   OnDisconnect(DisconnectReason::BROWSER_FRAME_DETACHED);
 }
 
-void CefFrameImpl::SendMessage(const std::string& name, base::Value arguments) {
+void CefFrameImpl::SendMessage(const std::string& name,
+                               base::Value::List arguments) {
   if (auto app = CefAppManager::Get()->GetApplication()) {
     if (auto handler = app->GetRenderProcessHandler()) {
-      auto& list_value = base::Value::AsListValue(arguments);
-      CefRefPtr<CefProcessMessageImpl> message(new CefProcessMessageImpl(
-          name, std::move(const_cast<base::ListValue&>(list_value)),
-          /*read_only=*/true));
+      CefRefPtr<CefProcessMessageImpl> message(
+          new CefProcessMessageImpl(name, std::move(arguments),
+                                    /*read_only=*/true));
       handler->OnProcessMessageReceived(browser_, this, PID_BROWSER,
                                         message.get());
     }
@@ -835,8 +835,9 @@ void CefFrameImpl::DidStopLoading() {
 void CefFrameImpl::MoveOrResizeStarted() {
   if (frame_) {
     auto web_view = frame_->View();
-    if (web_view)
+    if (web_view) {
       web_view->CancelPagePopup();
+    }
   }
 }
 
diff --git a/libcef/renderer/frame_impl.h b/libcef/renderer/frame_impl.h
index b6638d89a..39d8de6cb 100644
--- a/libcef/renderer/frame_impl.h
+++ b/libcef/renderer/frame_impl.h
@@ -149,7 +149,8 @@ class CefFrameImpl
   // cef::mojom::RenderFrame methods:
   void FrameAttachedAck() override;
   void FrameDetached() override;
-  void SendMessage(const std::string& name, base::Value arguments) override;
+  void SendMessage(const std::string& name,
+                   base::Value::List arguments) override;
   void SendSharedMemoryRegion(const std::string& name,
                               base::ReadOnlySharedMemoryRegion region) override;
   void SendCommand(const std::string& command) override;
diff --git a/libcef/renderer/render_manager.cc b/libcef/renderer/render_manager.cc
index 85a9cbb50..3b865186f 100644
--- a/libcef/renderer/render_manager.cc
+++ b/libcef/renderer/render_manager.cc
@@ -350,15 +350,11 @@ CefRefPtr<CefBrowserImpl> CefRenderManager::MaybeCreateBrowser(
     if (handler.get()) {
       CefRefPtr<CefDictionaryValueImpl> dictValuePtr;
       if (params->extra_info) {
-        auto& dict_value = base::Value::AsDictionaryValue(*params->extra_info);
-        dictValuePtr = new CefDictionaryValueImpl(
-            const_cast<base::DictionaryValue*>(&dict_value),
-            /*will_delete=*/false, /*read_only=*/true);
+        dictValuePtr =
+            new CefDictionaryValueImpl(std::move(*params->extra_info),
+                                       /*read_only=*/true);
       }
       handler->OnBrowserCreated(browser.get(), dictValuePtr.get());
-      if (dictValuePtr) {
-        std::ignore = dictValuePtr->Detach(nullptr);
-      }
     }
   }