diff --git a/attachment-viewer/build.gradle b/attachment-viewer/build.gradle
index d62062ae14..c393c5f483 100644
--- a/attachment-viewer/build.gradle
+++ b/attachment-viewer/build.gradle
@@ -34,11 +34,11 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_11
-        targetCompatibility JavaVersion.VERSION_11
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
     }
     kotlinOptions {
-        jvmTarget = "11"
+        jvmTarget = '1.8'
     }
 
     buildFeatures {
diff --git a/diff-match-patch/build.gradle b/diff-match-patch/build.gradle
index f623c57a49..82292e24db 100644
--- a/diff-match-patch/build.gradle
+++ b/diff-match-patch/build.gradle
@@ -3,3 +3,6 @@ apply plugin: 'java-library'
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 }
+
+sourceCompatibility = "8"
+targetCompatibility = "8"
diff --git a/library/ui-styles/build.gradle b/library/ui-styles/build.gradle
index 365e4b902c..e264ef8319 100644
--- a/library/ui-styles/build.gradle
+++ b/library/ui-styles/build.gradle
@@ -39,16 +39,13 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
-
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_11
-        targetCompatibility JavaVersion.VERSION_11
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
     }
-
     kotlinOptions {
-        jvmTarget = "11"
+        jvmTarget = '1.8'
     }
-
     buildFeatures {
         viewBinding true
     }
diff --git a/matrix-sdk-android-rx/build.gradle b/matrix-sdk-android-rx/build.gradle
index d18e3b1d72..93d2c42b9b 100644
--- a/matrix-sdk-android-rx/build.gradle
+++ b/matrix-sdk-android-rx/build.gradle
@@ -24,12 +24,12 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_11
-        targetCompatibility JavaVersion.VERSION_11
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
     }
 
     kotlinOptions {
-        jvmTarget = "11"
+        jvmTarget = "1.8"
     }
 }
 
diff --git a/matrix-sdk-android/build.gradle b/matrix-sdk-android/build.gradle
index cbae6a05b3..95e15885df 100644
--- a/matrix-sdk-android/build.gradle
+++ b/matrix-sdk-android/build.gradle
@@ -68,12 +68,12 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_11
-        targetCompatibility JavaVersion.VERSION_11
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
     }
 
     kotlinOptions {
-        jvmTarget = "11"
+        jvmTarget = "1.8"
     }
 
     sourceSets {
diff --git a/vector/build.gradle b/vector/build.gradle
index b9e9873369..52771f37d5 100644
--- a/vector/build.gradle
+++ b/vector/build.gradle
@@ -294,12 +294,12 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_11
-        targetCompatibility JavaVersion.VERSION_11
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
     }
 
     kotlinOptions {
-        jvmTarget = "11"
+        jvmTarget = "1.8"
     }
 
     sourceSets {