diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index a721781..57bf367 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -15,25 +15,32 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
-
-    - name: Validate composer.json and composer.lock
-      run: composer validate --strict
-
-    - name: Cache Composer packages
-      id: composer-cache
-      uses: actions/cache@v3
-      with:
-        path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
-        restore-keys: |
-          ${{ runner.os }}-php-
-
-    - name: Install dependencies
-      run: composer install --prefer-dist --no-progress
-
-    # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
-    # Docs: https://getcomposer.org/doc/articles/scripts.md
-
-    - name: Run test suite
-      run: composer run-script algs4:validate
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          coverage: "none"
+          ini-values: date.timezone=UTC,memory_limit=-1,default_socket_timeout=10,session.gc_probability=0,apc.enable_cli=1,zend.assertions=1
+          php-version: "8.3"
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v3
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
+      # Docs: https://getcomposer.org/doc/articles/scripts.md
+
+      - name: Run test suite
+        run: composer run-script algs4:validate
diff --git a/composer.json b/composer.json
index cab6874..00b3ec2 100644
--- a/composer.json
+++ b/composer.json
@@ -13,9 +13,6 @@
     "php": "^8.3",
     "symfony/console": "^7.0"
   },
-  "platform": {
-    "php": "8.3"
-  },
   "require-dev": {
     "phpunit/phpunit": "^10",
     "phpstan/phpstan": "^1.10"