diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b313204..872057e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,7 @@ jobs:
   build:
     strategy:
       matrix:
-        java: [11, 17]
+        java: [11, 17, 21]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     env: