diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d309b1c..19ea3d7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        java_version: [17]
+        java_version: [21]
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/publish-release.yml b/.github/workflows/publish-release.yml
index eae7dab..911e52f 100644
--- a/.github/workflows/publish-release.yml
+++ b/.github/workflows/publish-release.yml
@@ -15,11 +15,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
 
-      - name: Install JDK 17
+      - name: Install JDK 21
         uses: actions/setup-java@v5
         with:
           distribution: 'zulu'
-          java-version: 17
+          java-version: 21
 
       - name: Setup gradle
         uses: gradle/gradle-build-action@v3
diff --git a/.github/workflows/publish-snapshot.yml b/.github/workflows/publish-snapshot.yml
index c74b755..cafad57 100644
--- a/.github/workflows/publish-snapshot.yml
+++ b/.github/workflows/publish-snapshot.yml
@@ -15,11 +15,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
 
-      - name: Install JDK 17
+      - name: Install JDK 21
         uses: actions/setup-java@v5
         with:
           distribution: 'zulu'
-          java-version: 17
+          java-version: 21
 
       - name: Setup gradle
         uses: gradle/gradle-build-action@v3
diff --git a/junit4-android-integration-rules/build.gradle b/junit4-android-integration-rules/build.gradle
index 8890bfd..ac8796f 100644
--- a/junit4-android-integration-rules/build.gradle
+++ b/junit4-android-integration-rules/build.gradle
@@ -13,7 +13,7 @@ licensee {
 
 kotlin {
   jvmToolchain {
-    languageVersion.set(JavaLanguageVersion.of(11))
+    languageVersion.set(JavaLanguageVersion.of(21))
   }
 }
 
@@ -22,11 +22,6 @@ android {
 
   compileSdkVersion rootProject.ext.compileSdkVersion as int
 
-  compileOptions {
-    sourceCompatibility = JavaVersion.VERSION_11
-    targetCompatibility = JavaVersion.VERSION_11
-  }
-
   defaultConfig {
     minSdkVersion rootProject.ext.minSdkVersion as int
 
diff --git a/junit4-rules/build.gradle b/junit4-rules/build.gradle
index d85fd8d..795c9a4 100644
--- a/junit4-rules/build.gradle
+++ b/junit4-rules/build.gradle
@@ -8,8 +8,8 @@ licensee {
   allow("BSD-2-Clause")
 }
 
-java.targetCompatibility = JavaVersion.VERSION_11
-java.sourceCompatibility = JavaVersion.VERSION_11
+java.targetCompatibility = JavaVersion.VERSION_21
+java.sourceCompatibility = JavaVersion.VERSION_21
 
 dependencies {
   api deps.test.junit