diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4c1ac3f..88659ed 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         scala-version: [2.13.12]
-        java-version: [8, 11, 17]
+        java-version: [8, 11, 17, 21]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3