diff --git a/samples/admob/app_open_example/.gitignore b/samples/admob/app_open_example/.gitignore
index 29a3a5017..79c113f9b 100644
--- a/samples/admob/app_open_example/.gitignore
+++ b/samples/admob/app_open_example/.gitignore
@@ -5,9 +5,11 @@
 *.swp
 .DS_Store
 .atom/
+.build/
 .buildlog/
 .history
 .svn/
+.swiftpm/
 migrate_working_dir/
 
 # IntelliJ related
diff --git a/samples/admob/app_open_example/android/app/build.gradle b/samples/admob/app_open_example/android/app/build.gradle
index e5114805e..64a6a3bd4 100644
--- a/samples/admob/app_open_example/android/app/build.gradle
+++ b/samples/admob/app_open_example/android/app/build.gradle
@@ -25,7 +25,7 @@ if (flutterVersionName == null) {
 android {
     namespace "com.example.app_open_example"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
diff --git a/samples/admob/app_open_example/pubspec.yaml b/samples/admob/app_open_example/pubspec.yaml
index 1408a0aa9..a26ce9380 100644
--- a/samples/admob/app_open_example/pubspec.yaml
+++ b/samples/admob/app_open_example/pubspec.yaml
@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
 dev_dependencies:
   flutter_test:
diff --git a/samples/admob/banner_example/.gitignore b/samples/admob/banner_example/.gitignore
index 24476c5d1..6c319542b 100644
--- a/samples/admob/banner_example/.gitignore
+++ b/samples/admob/banner_example/.gitignore
@@ -5,9 +5,11 @@
 *.swp
 .DS_Store
 .atom/
+.build/
 .buildlog/
 .history
 .svn/
+.swiftpm/
 migrate_working_dir/
 
 # IntelliJ related
diff --git a/samples/admob/banner_example/android/app/build.gradle b/samples/admob/banner_example/android/app/build.gradle
index 6007fea25..7f04198ad 100644
--- a/samples/admob/banner_example/android/app/build.gradle
+++ b/samples/admob/banner_example/android/app/build.gradle
@@ -25,7 +25,7 @@ if (flutterVersionName == null) {
 android {
     namespace "com.example.banner_example"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
diff --git a/samples/admob/banner_example/pubspec.yaml b/samples/admob/banner_example/pubspec.yaml
index dae4fbcfe..e9900e4ab 100644
--- a/samples/admob/banner_example/pubspec.yaml
+++ b/samples/admob/banner_example/pubspec.yaml
@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
 dev_dependencies:
   flutter_test:
diff --git a/samples/admob/interstitial_example/.gitignore b/samples/admob/interstitial_example/.gitignore
index 24476c5d1..6c319542b 100644
--- a/samples/admob/interstitial_example/.gitignore
+++ b/samples/admob/interstitial_example/.gitignore
@@ -5,9 +5,11 @@
 *.swp
 .DS_Store
 .atom/
+.build/
 .buildlog/
 .history
 .svn/
+.swiftpm/
 migrate_working_dir/
 
 # IntelliJ related
diff --git a/samples/admob/interstitial_example/android/app/build.gradle b/samples/admob/interstitial_example/android/app/build.gradle
index 14eac3f3e..2c46f036b 100644
--- a/samples/admob/interstitial_example/android/app/build.gradle
+++ b/samples/admob/interstitial_example/android/app/build.gradle
@@ -25,7 +25,7 @@ if (flutterVersionName == null) {
 android {
     namespace "com.example.interstitial_example"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
diff --git a/samples/admob/interstitial_example/pubspec.yaml b/samples/admob/interstitial_example/pubspec.yaml
index c9ef23b4b..68637b5a3 100644
--- a/samples/admob/interstitial_example/pubspec.yaml
+++ b/samples/admob/interstitial_example/pubspec.yaml
@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
 dev_dependencies:
   flutter_test:
diff --git a/samples/admob/mediation_example/android/app/build.gradle b/samples/admob/mediation_example/android/app/build.gradle
index e0ee2265e..56a2c0c34 100644
--- a/samples/admob/mediation_example/android/app/build.gradle
+++ b/samples/admob/mediation_example/android/app/build.gradle
@@ -25,8 +25,9 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
+    namespace "com.example.mediationexample"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
diff --git a/samples/admob/mediation_example/android/build.gradle b/samples/admob/mediation_example/android/build.gradle
index 31ae933da..8f7e4949b 100644
--- a/samples/admob/mediation_example/android/build.gradle
+++ b/samples/admob/mediation_example/android/build.gradle
@@ -23,6 +23,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
-    delete rootProject.buildDir
+tasks.register("clean", Delete) {
+    delete rootProject.layout.buildDirectory
 }
diff --git a/samples/admob/mediation_example/pubspec.yaml b/samples/admob/mediation_example/pubspec.yaml
index e61c177c8..36496f641 100644
--- a/samples/admob/mediation_example/pubspec.yaml
+++ b/samples/admob/mediation_example/pubspec.yaml
@@ -23,7 +23,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
   # The following adds the Cupertino Icons font to your application.
 
diff --git a/samples/admob/native_platform_example/android/app/build.gradle b/samples/admob/native_platform_example/android/app/build.gradle
index 8d4aba91a..fc7d924c9 100644
--- a/samples/admob/native_platform_example/android/app/build.gradle
+++ b/samples/admob/native_platform_example/android/app/build.gradle
@@ -26,8 +26,9 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
+    namespace = "com.example.native_platform_example"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
diff --git a/samples/admob/native_platform_example/pubspec.yaml b/samples/admob/native_platform_example/pubspec.yaml
index 5d2569840..8bfb3bf31 100644
--- a/samples/admob/native_platform_example/pubspec.yaml
+++ b/samples/admob/native_platform_example/pubspec.yaml
@@ -30,7 +30,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
diff --git a/samples/admob/native_template_example/android/app/build.gradle b/samples/admob/native_template_example/android/app/build.gradle
index 20372d9ef..ca85deb43 100644
--- a/samples/admob/native_template_example/android/app/build.gradle
+++ b/samples/admob/native_template_example/android/app/build.gradle
@@ -26,8 +26,9 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
+    namespace = "com.example.native_template_example" 
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
diff --git a/samples/admob/native_template_example/pubspec.yaml b/samples/admob/native_template_example/pubspec.yaml
index 7c913abc8..b870c7a04 100644
--- a/samples/admob/native_template_example/pubspec.yaml
+++ b/samples/admob/native_template_example/pubspec.yaml
@@ -30,7 +30,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
diff --git a/samples/admob/rewarded_example/android/app/build.gradle b/samples/admob/rewarded_example/android/app/build.gradle
index 0c60e66c5..45ddec980 100644
--- a/samples/admob/rewarded_example/android/app/build.gradle
+++ b/samples/admob/rewarded_example/android/app/build.gradle
@@ -25,7 +25,7 @@ if (flutterVersionName == null) {
 android {
     namespace "com.example.rewarded_example"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
diff --git a/samples/admob/rewarded_example/pubspec.yaml b/samples/admob/rewarded_example/pubspec.yaml
index 841f224ee..c17551f6c 100644
--- a/samples/admob/rewarded_example/pubspec.yaml
+++ b/samples/admob/rewarded_example/pubspec.yaml
@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
 dev_dependencies:
   flutter_test:
diff --git a/samples/admob/rewarded_interstitial_example/android/app/build.gradle b/samples/admob/rewarded_interstitial_example/android/app/build.gradle
index fd140ab5a..793b1d4c8 100644
--- a/samples/admob/rewarded_interstitial_example/android/app/build.gradle
+++ b/samples/admob/rewarded_interstitial_example/android/app/build.gradle
@@ -25,7 +25,7 @@ if (flutterVersionName == null) {
 android {
     namespace "com.example.rewarded_interstitial_example"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion = "26.1.10909125"
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
diff --git a/samples/admob/rewarded_interstitial_example/pubspec.yaml b/samples/admob/rewarded_interstitial_example/pubspec.yaml
index 7980a8743..4089266b2 100644
--- a/samples/admob/rewarded_interstitial_example/pubspec.yaml
+++ b/samples/admob/rewarded_interstitial_example/pubspec.yaml
@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  google_mobile_ads: ^5.2.0
+  google_mobile_ads: ^5.3.0
 
 dev_dependencies:
   flutter_test: