diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index 0bcfb13..331149b 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '8', '11', '17', '21' ]
+        java: [ '8', '11' ]
 
     name: Java ${{ matrix.java }} build
     steps: