diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 14bba4b..5e3c2a7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         scala-version: [2.13.x]
-        java-version: [8, 11, 17]
+        java-version: [8, 11, 17, 21]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v3