diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3dd061c..ef5f7d1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [ '8', '11', '16', '17', '19' , '21' ]
+        java: [ '8', '11', '16', '17', '19' ]
         runs-on: [ubuntu-latest, macos-latest, windows-latest]
 
     name: Test on Java ${{ matrix.Java }} on ${{ matrix.runs-on }}