diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e61bb1d3..7b93c824 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [11, 17]
+        java: [11, 17, 21]
     name: build with jdk ${{matrix.java}}
 
     steps:
@@ -49,7 +49,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        java: [11, 17]
+        java: [11, 17, 21]
     name: build with jdk ${{matrix.java}} windows
 
     steps: