diff --git a/.github/workflows/deploy-snapshot.yml b/.github/workflows/deploy-snapshot.yml
index a40c9c72..2995fe94 100644
--- a/.github/workflows/deploy-snapshot.yml
+++ b/.github/workflows/deploy-snapshot.yml
@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
         with:
-          java-version: 17
+          java-version: 21
           distribution: 'temurin'
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index c8f5faff..c1c6c000 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
         with:
-          java-version: 17
+          java-version: 21
           distribution: 'temurin'
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ecb393f0..c24d8aeb 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
         with:
-          java-version: 17
+          java-version: 21
           distribution: 'temurin'
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
diff --git a/buildSrc/src/main/kotlin/config-kotlin.gradle.kts b/buildSrc/src/main/kotlin/config-kotlin.gradle.kts
index 61a0409f..fd30d02c 100644
--- a/buildSrc/src/main/kotlin/config-kotlin.gradle.kts
+++ b/buildSrc/src/main/kotlin/config-kotlin.gradle.kts
@@ -19,7 +19,7 @@ tasks.withType(JavaCompile::class).configureEach {
 
 kotlin {
     jvmToolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
     compilerOptions {
         jvmTarget = JvmTarget.JVM_17