diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 62a0bb6..2685bb7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,6 +15,10 @@ jobs:
         path: metafacture-core
         repository: metafacture/metafacture-core
         ref: 5.5.1-rc1
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
     - name: Install metafacture-core (temporary)
       working-directory: metafacture-core
       run: ./gradlew install
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2808aca..bedcd36 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,6 +14,10 @@ jobs:
         path: metafacture-core
         repository: metafacture/metafacture-core
         ref: 5.5.1-rc1
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
     - name: Install metafacture-core (temporary)
       working-directory: metafacture-core
       run: ./gradlew install