diff --git a/.github/workflows/pipeline.yml b/.github/workflows/pipeline.yml
index 46c1592..edd0057 100644
--- a/.github/workflows/pipeline.yml
+++ b/.github/workflows/pipeline.yml
@@ -41,7 +41,7 @@ jobs:
       max-parallel: 1
       matrix:
         # build against supported Java LTS versions:
-        java: [ 8, 11, 17, 21 ]
+        java: [ 8, '11.0.21', 17, 21 ]
     name: Java ${{ matrix.java }}
     steps:
       - uses: actions/checkout@v3