diff --git a/.github/workflows/gradle-build.yml b/.github/workflows/gradle-build.yml
index ee81eae9..1d69479c 100644
--- a/.github/workflows/gradle-build.yml
+++ b/.github/workflows/gradle-build.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        java: [17]
+        java: [17, 21]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4