diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 005a3b9..f85e9a1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -88,15 +88,15 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 21
+          java-version: 8
 
       - name: Cache Gradle dependencies
         uses: actions/cache@v3
         with:
           path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-21debug-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          key: ${{ runner.os }}-gradle-8debug-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
           restore-keys: |
-            ${{ runner.os }}-gradle-21debug
+            ${{ runner.os }}-gradle-8debug-
 
       # Step 9: Build the APK
       - name: Build APK