diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 86536a2..19ac41d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -19,7 +19,8 @@ jobs:
         php-version: ['7.2', '7.3', '7.4', '8.0', '8.1']
         coverage: ['pcov']
         include:
-          - { php-version: '7.1', coverage: 'xdebug' }
+          - php-version: '7.1'
+            coverage: xdebug
 
     name: Test with PHP ${{ matrix.php-version }}
 
@@ -50,7 +51,7 @@ jobs:
       - name: Set package version for Composer
         uses: ergebnis/composer-root-version-action@0.2.1
         with:
-          branch: "main"
+          branch: main
 
       - name: Install dependencies
         run: |
@@ -68,7 +69,7 @@ jobs:
     runs-on: ubuntu-latest
 
     env:
-      PHP_VERSION: 7.4
+      PHP_VERSION: '7.4'
 
     steps:
       - name: Checkout code
@@ -94,7 +95,7 @@ jobs:
       - name: Set package version for Composer
         uses: ergebnis/composer-root-version-action@0.2.1
         with:
-          branch: "main"
+          branch: main
 
       - name: Install dependencies
         run: |
@@ -120,8 +121,8 @@ jobs:
     runs-on: ubuntu-latest
 
     env:
-      PHP_VERSION: 7.4
-      PHP_CS_FIXER_VERSION: v3.0.0
+      PHP_VERSION: '7.4'
+      PHP_CS_FIXER_VERSION: 'v3.0.0'
 
     steps:
       - name: Checkout
@@ -137,8 +138,8 @@ jobs:
         uses: actions/cache@v2
         with:
           path: .php_cs.cache
-          key: "php-cs-fixer"
-          restore-keys: "php-cs-fixer"
+          key: php-cs-fixer
+          restore-keys: php-cs-fixer
 
       - name: Run PHP-CS-Fixer, version ${{ env.PHP_CS_FIXER_VERSION }}
         run: |