diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 078c323b..55473fcb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        java: [ '11', '17' ]
+        java: [ '17', '21' ]
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK