diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8a2c52b6..bd8d7e56 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-java@v4
         with:
-          java-version: 17
+          java-version: 21
           distribution: temurin
           cache: 'gradle'
       - name: Build and Test
diff --git a/build.gradle b/build.gradle
index cd6ae5d8..3ba9d067 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,7 +19,7 @@ bootRun {
 
 java {
 	toolchain {
-		languageVersion = JavaLanguageVersion.of(17)
+		languageVersion = JavaLanguageVersion.of(21)
 	}
 }