diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 64244ae..db9b631 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 7.4
+          php-version: "7.4"
 
       - name: Install PHP dependencies
         uses: ramsey/composer-install@v3
@@ -61,7 +61,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 7.4
+          php-version: "7.4"
 
       - name: Install PHP dependencies
         uses: ramsey/composer-install@v3
@@ -79,8 +79,7 @@ jobs:
       max-parallel: 3
       matrix:
         php-version: ["7.4", "8.0", "8.1", "8.2", "8.3", "8.4"]
-        stability: [prefer-lowest, prefer-stable]
-        machine: [windows-latest, ubuntu-latest]
+        dependencies: [lowest, highest]
 
     steps:
       - name: Checkout code
@@ -93,6 +92,8 @@ jobs:
 
       - name: Install PHP dependencies
         uses: ramsey/composer-install@v3
+        with:
+          dependency-versions: ${{ matrix.dependencies }}
 
       - name: Run test
         run: vendor/bin/phpunit --coverage-clover coverage.xml