diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c7a437b29..d89846ac0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        jdk: [ 8, 11, 17 ]
+        jdk: [ 8, 21 ]
         os: [ ubuntu-20.04 ]
       fail-fast: true
     if: |