diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ffffecc..94a942c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     name: Build and Run
     strategy:
       matrix:
-        java-version: [8, 11, 17]
+        java-version: [8, 11, 17, 21]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout current branch (full)