diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 27112c6..6ec2e42 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -8,11 +8,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: set up JDK 17
+      - name: set up JDK 21
         uses: actions/setup-java@v3
         with:
           distribution: 'temurin'
-          java-version: '17'
+          java-version: '21'
       - name: grant execute permission for gradlew
         run: chmod +x gradlew
       - name: build with gradle