diff --git a/config/services.php b/config/services.php
index b7a92b3e5..675b9a1ee 100644
--- a/config/services.php
+++ b/config/services.php
@@ -336,6 +336,7 @@ return [
          */
         foreach ($receivers as $messageClass => $handlerClass) {
             $handlers[$messageClass][] = static function ($message) use ($handlerClass, $di) {
+                /** @var callable $obj */
                 $obj = $di->get($handlerClass);
                 return $obj($message);
             };
diff --git a/phpstan.neon b/phpstan.neon
index cd6f7b389..55329b27e 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -31,6 +31,10 @@ parameters:
     scanDirectories:
        - ./vendor/zircote/swagger-php/src/Annotations
 
+    stubFiles:
+        - util/phpstan_di.stub
+        - util/phpstan_phpdi.stub
+
     universalObjectCratesClasses:
         - App\Session\NamespaceInterface
         - App\View
diff --git a/src/CallableEventDispatcher.php b/src/CallableEventDispatcher.php
index 0974bb824..0d94d507d 100644
--- a/src/CallableEventDispatcher.php
+++ b/src/CallableEventDispatcher.php
@@ -85,6 +85,9 @@ final class CallableEventDispatcher extends EventDispatcher implements CallableE
         }
     }
 
+    /**
+     * @param class-string $className
+     */
     public function addCallableListener(
         string $eventName,
         string $className,
@@ -98,6 +101,9 @@ final class CallableEventDispatcher extends EventDispatcher implements CallableE
         );
     }
 
+    /**
+     * @param class-string $className
+     */
     public function removeCallableListener(
         string $eventName,
         string $className,
@@ -109,6 +115,9 @@ final class CallableEventDispatcher extends EventDispatcher implements CallableE
         );
     }
 
+    /**
+     * @param class-string $className
+     */
     private function getCallable(
         string $className,
         ?string $method = '__invoke'
diff --git a/src/Console/Command/SetupFixturesCommand.php b/src/Console/Command/SetupFixturesCommand.php
index 5102a38a0..e67d26538 100644
--- a/src/Console/Command/SetupFixturesCommand.php
+++ b/src/Console/Command/SetupFixturesCommand.php
@@ -8,6 +8,7 @@ use App\Container\ContainerAwareTrait;
 use App\Container\EntityManagerAwareTrait;
 use App\Container\EnvironmentAwareTrait;
 use Doctrine\Common\DataFixtures\Executor\ORMExecutor;
+use Doctrine\Common\DataFixtures\FixtureInterface;
 use Doctrine\Common\DataFixtures\Loader;
 use Doctrine\Common\DataFixtures\Purger\ORMPurger;
 use RecursiveDirectoryIterator;
@@ -46,7 +47,10 @@ final class SetupFixturesCommand extends CommandAbstract
                 continue;
             }
 
+            /** @var class-string $className */
             $className = 'App\\Entity\\Fixture\\' . $fileName;
+
+            /** @var FixtureInterface $fixture */
             $fixture = $this->di->get($className);
 
             $loader->addFixture($fixture);
diff --git a/src/Console/Command/Sync/NowPlayingCommand.php b/src/Console/Command/Sync/NowPlayingCommand.php
index f4d73f8f8..aa86c8af4 100644
--- a/src/Console/Command/Sync/NowPlayingCommand.php
+++ b/src/Console/Command/Sync/NowPlayingCommand.php
@@ -114,7 +114,7 @@ final class NowPlayingCommand extends AbstractSyncRunnerCommand
         $lookupRaw = $this->nowPlayingCache->getLookup();
         $lookup = [];
         foreach ($lookupRaw as $stationRow) {
-            $lookup[$stationRow['short_name']] = (int)($stationRow['updated_at'] ?? 0);
+            $lookup[$stationRow['short_name']] = $stationRow['updated_at'];
         }
 
         $allStations = $this->em->createQuery(
diff --git a/src/Controller/Api/Stations/Files/ListAction.php b/src/Controller/Api/Stations/Files/ListAction.php
index 3408450c9..0a2099848 100644
--- a/src/Controller/Api/Stations/Files/ListAction.php
+++ b/src/Controller/Api/Stations/Files/ListAction.php
@@ -59,7 +59,7 @@ final class ListAction implements SingleActionInterface
 
         [$searchPhrase, $playlist, $special] = $this->parseSearchQuery(
             $station,
-            $searchPhraseFull
+            $searchPhraseFull ?? ''
         );
 
         $cacheKeyParts = [
diff --git a/src/Radio/Adapters.php b/src/Radio/Adapters.php
index 1b68f455f..2aa8ac6d4 100644
--- a/src/Radio/Adapters.php
+++ b/src/Radio/Adapters.php
@@ -17,6 +17,12 @@ use App\Radio\Enums\RemoteAdapters;
 
 /**
  * Manager class for radio adapters.
+ *
+ * @phpstan-type AdapterInfo array<string, array{
+ *     enum: AdapterTypeInterface,
+ *     name: string,
+ *     class: class-string|null
+ * }>
  */
 final class Adapters
 {
@@ -109,10 +115,11 @@ final class Adapters
     /**
      * @param array<AdapterTypeInterface> $cases
      * @param bool $checkInstalled
-     * @return mixed[]
+     * @return AdapterInfo
      */
     private function listAdaptersFromEnum(array $cases, bool $checkInstalled = false): array
     {
+        /** @var AdapterInfo $adapters */
         $adapters = [];
         foreach ($cases as $adapter) {
             $adapters[$adapter->getValue()] = [
@@ -130,9 +137,10 @@ final class Adapters
                         return true;
                     }
 
-                    /** @var AbstractLocalAdapter $adapter */
                     $adapter = $this->di->get($adapterInfo['class']);
-                    return $adapter->isInstalled();
+                    return ($adapter instanceof AbstractLocalAdapter)
+                        ? $adapter->isInstalled()
+                        : true;
                 }
             );
         }
diff --git a/src/Radio/Enums/AdapterTypeInterface.php b/src/Radio/Enums/AdapterTypeInterface.php
index b4d8d7594..413341da7 100644
--- a/src/Radio/Enums/AdapterTypeInterface.php
+++ b/src/Radio/Enums/AdapterTypeInterface.php
@@ -10,5 +10,6 @@ interface AdapterTypeInterface
 
     public function getName(): string;
 
+    /** @return class-string|null */
     public function getClass(): ?string;
 }
diff --git a/src/Radio/Enums/BackendAdapters.php b/src/Radio/Enums/BackendAdapters.php
index d4ddce572..1abf7d5eb 100644
--- a/src/Radio/Enums/BackendAdapters.php
+++ b/src/Radio/Enums/BackendAdapters.php
@@ -24,6 +24,9 @@ enum BackendAdapters: string implements AdapterTypeInterface
         };
     }
 
+    /**
+     * @return class-string<Liquidsoap>|null
+     */
     public function getClass(): ?string
     {
         return match ($this) {
diff --git a/src/Radio/Enums/FrontendAdapters.php b/src/Radio/Enums/FrontendAdapters.php
index 21daaacd8..b8021b315 100644
--- a/src/Radio/Enums/FrontendAdapters.php
+++ b/src/Radio/Enums/FrontendAdapters.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Radio\Enums;
 
+use App\Radio\Frontend\AbstractFrontend;
 use App\Radio\Frontend\Icecast;
 use App\Radio\Frontend\Shoutcast;
 
@@ -27,6 +28,9 @@ enum FrontendAdapters: string implements AdapterTypeInterface
         };
     }
 
+    /**
+     * @return class-string<AbstractFrontend>|null
+     */
     public function getClass(): ?string
     {
         return match ($this) {
diff --git a/src/Radio/Enums/RemoteAdapters.php b/src/Radio/Enums/RemoteAdapters.php
index 1f7fd4c8a..283d21c7d 100644
--- a/src/Radio/Enums/RemoteAdapters.php
+++ b/src/Radio/Enums/RemoteAdapters.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Radio\Enums;
 
+use App\Radio\Remote\AbstractRemote;
 use App\Radio\Remote\AzuraRelay;
 use App\Radio\Remote\Icecast;
 use App\Radio\Remote\Shoutcast1;
@@ -31,6 +32,9 @@ enum RemoteAdapters: string implements AdapterTypeInterface
         };
     }
 
+    /**
+     * @return class-string<AbstractRemote>
+     */
     public function getClass(): string
     {
         return match ($this) {
diff --git a/util/phpstan_di.stub b/util/phpstan_di.stub
new file mode 100644
index 000000000..42dc9873e
--- /dev/null
+++ b/util/phpstan_di.stub
@@ -0,0 +1,15 @@
+<?php
+
+namespace Psr\Container;
+
+interface ContainerInterface
+{
+    /**
+     * Finds an entry of the container by its identifier and returns it.
+     *
+     * @template T
+     * @param class-string<T> $id Identifier of the entry to look for.
+     * @return T Entry.
+     */
+    public function get(string $id);
+}
diff --git a/util/phpstan_phpdi.stub b/util/phpstan_phpdi.stub
new file mode 100644
index 000000000..568066bc2
--- /dev/null
+++ b/util/phpstan_phpdi.stub
@@ -0,0 +1,15 @@
+<?php
+
+namespace DI;
+
+class Container
+{
+    /**
+     * Finds an entry of the container by its identifier and returns it.
+     *
+     * @template T
+     * @param class-string<T> $id Identifier of the entry to look for.
+     * @return T Entry.
+     */
+    public function get(string $id);
+}