diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8ffd7b48..4a9beabc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '17', '20' ]
+        java: [ '17', '21' ]
 
     steps:
       - uses: actions/checkout@v3