diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a3a248c..0eede76 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
   build:
     strategy:
       matrix:
-        java: [ '11', '15', '17' ]
+        java: [ '11', '17', '21' ]
         os: [ 'ubuntu-20.04', 'windows-latest' ]
     runs-on: ${{ matrix.os }}
     steps: