diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a4ddfcb9..e99f6737 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         node-version: [10.x, 12.x, 14.x]
-        os: [macos-latest, ubuntu-latest, windows-latest]
+        os: ['macos-latest', 'ubuntu-latest', 'windows-latest']
 
     steps:
       - uses: actions/checkout@v2
@@ -32,10 +32,10 @@ jobs:
       - name: unit tests (jest+playwright)
         run: npm run test:jest-unit -- -ci
       - uses: microsoft/playwright-github-action@v1.3.0
-      - if: matrix.os == "macos-latest"
+      - if: matrix.os == 'macos-latest'
         name: e2e tests (maxWorkers=50%)
         run: npm run test:jest-e2e -- -ci --maxWorkers=50%
-      - if: matrix.os != "macos-latest"
+      - if: matrix.os != 'macos-latest'
         name: e2e tests
         run: npm run test:jest-e2e -- -ci
       - name: Upload artifacts (diff output)