diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bbbb5b4c..7d8eccb7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,14 +12,17 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [1.8, 9]
 
     steps:
     - uses: actions/checkout@v2
 
-    - name: Set up JDK 1.8
+    - name: Setup Java ${{ matrix.java }}
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: ${{ matrix.java }}
 
     - name: Cache Gradle wrapper
       uses: actions/cache@v1