diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 4775c47e..9db822b2 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -4,10 +4,10 @@ on: pull_request
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy: matrix
-    matrix:
-      ruby: ["2.5", "2.6", "2.7", "3.0"]
-      db: [sqlite, mysql, postgres]
+    strategy:
+      matrix:
+        ruby: ["2.5", "2.6", "2.7", "3.0"]
+        db: [sqlite, mysql, postgres]
     steps:
       - uses: actions/checkout@v1
       - run: bash -x script/cibuild ${{ matrix.ruby }} ${{ matrix.db }}
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