diff --git a/AccessibilityCodelab/build.gradle b/AccessibilityCodelab/build.gradle
index 04cfdc031..66e8c7623 100644
--- a/AccessibilityCodelab/build.gradle
+++ b/AccessibilityCodelab/build.gradle
@@ -22,7 +22,7 @@ buildscript {
 
     dependencies {
         classpath 'com.android.tools.build:gradle:8.1.4'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21"
     }
 }
 
diff --git a/AdaptiveUiCodelab/build.gradle b/AdaptiveUiCodelab/build.gradle
index 7870b4a13..bc2ba7eca 100644
--- a/AdaptiveUiCodelab/build.gradle
+++ b/AdaptiveUiCodelab/build.gradle
@@ -21,7 +21,7 @@ buildscript {
     }
     dependencies {
         classpath "com.android.tools.build:gradle:8.1.4"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21"
     }
 }
 
diff --git a/AdvancedStateAndSideEffectsCodelab/app/build.gradle b/AdvancedStateAndSideEffectsCodelab/app/build.gradle
index 17fe254d2..c7a6a35d2 100644
--- a/AdvancedStateAndSideEffectsCodelab/app/build.gradle
+++ b/AdvancedStateAndSideEffectsCodelab/app/build.gradle
@@ -96,7 +96,7 @@ android {
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.20"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.21"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3"
     implementation "com.google.android.libraries.maps:maps:3.1.0-beta"
     implementation "com.google.maps.android:maps-v3-ktx:3.4.0"
diff --git a/AdvancedStateAndSideEffectsCodelab/build.gradle b/AdvancedStateAndSideEffectsCodelab/build.gradle
index 28c40ba34..58e484649 100644
--- a/AdvancedStateAndSideEffectsCodelab/build.gradle
+++ b/AdvancedStateAndSideEffectsCodelab/build.gradle
@@ -21,7 +21,7 @@ buildscript {
     }
     dependencies {
         classpath "com.android.tools.build:gradle:8.1.4"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21"
         classpath "com.google.dagger:hilt-android-gradle-plugin:2.48.1"
     }
 }
diff --git a/BasicLayoutsCodelab/build.gradle b/BasicLayoutsCodelab/build.gradle
index 5a95beb8b..2783f4a4c 100644
--- a/BasicLayoutsCodelab/build.gradle
+++ b/BasicLayoutsCodelab/build.gradle
@@ -20,7 +20,7 @@ buildscript {
     }
     dependencies {
         classpath "com.android.tools.build:gradle:8.1.4"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21"
     }
 }
 
diff --git a/MigrationCodelab/app/build.gradle b/MigrationCodelab/app/build.gradle
index 7f9b4a373..2bee41b71 100644
--- a/MigrationCodelab/app/build.gradle
+++ b/MigrationCodelab/app/build.gradle
@@ -83,7 +83,7 @@ dependencies {
     implementation "com.github.bumptech.glide:glide:4.16.0"
     implementation "com.google.android.material:material:1.10.0"
     implementation "com.google.code.gson:gson:2.10.1"
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.20"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.21"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3"
 
diff --git a/MigrationCodelab/build.gradle b/MigrationCodelab/build.gradle
index 40290a17f..af1c75f7f 100644
--- a/MigrationCodelab/build.gradle
+++ b/MigrationCodelab/build.gradle
@@ -22,7 +22,7 @@ buildscript {
 
     dependencies {
         classpath "com.android.tools.build:gradle:8.1.4"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21"
         classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.7.5"
     }
 }
diff --git a/NavigationCodelab/build.gradle b/NavigationCodelab/build.gradle
index a4a7cfe3d..5d6f61e0d 100644
--- a/NavigationCodelab/build.gradle
+++ b/NavigationCodelab/build.gradle
@@ -22,7 +22,7 @@ buildscript {
 
     dependencies {
         classpath "com.android.tools.build:gradle:8.1.4"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21"
     }
 }
 
diff --git a/TestingCodelab/build.gradle b/TestingCodelab/build.gradle
index b8f27768c..293a4040d 100644
--- a/TestingCodelab/build.gradle
+++ b/TestingCodelab/build.gradle
@@ -31,7 +31,7 @@ buildscript {
         espressoVersion = '3.5.1'
         fragmentVersion = '1.6.2'
         junitVersion = '4.13.1'
-        kotlinVersion = '1.9.20'
+        kotlinVersion = '1.9.21'
         ktlintVersion = '0.48.2'
         ktxVersion = '1.12.0'
         lifecycleVersion = '2.3.0'
diff --git a/ThemingCodelab/build.gradle b/ThemingCodelab/build.gradle
index 18cd404e2..9fbfbbc8c 100644
--- a/ThemingCodelab/build.gradle
+++ b/ThemingCodelab/build.gradle
@@ -22,7 +22,7 @@ buildscript {
 
     dependencies {
         classpath 'com.android.tools.build:gradle:8.1.4'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21"
     }
 }