diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f0aabdd17..7e64845fd 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11]
+        java: [8, 11, 21]
     steps:
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
     - uses: actions/setup-java@v1