diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index fef81f2..8b06144 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -119,6 +119,14 @@ jobs:
           cache: maven
           cache-dependency-path: 'pom.xml' # optional
 
+      - name: Setup Java 21 (for act)
+        if: ${{ runner.os == 'Linux' && env.ACT_RUNNER == 'true' }}
+        run: |
+          apt-get update -y
+          apt-get install -y openjdk-21-jdk
+          java -version
+          echo "Java 21 setup completed."
+
       - name: Set up Maven
         uses: stCarolas/setup-maven@v5
         with: