diff --git a/composer.json b/composer.json
index 8084e4a..37174b2 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
   "require-dev": {
     "ergebnis/composer-normalize": "^2.11",
     "jangregor/phpstan-prophecy": "^1",
-    "mll-lab/php-cs-fixer-config": "^5",
+    "mll-lab/php-cs-fixer-config": "^4",
     "orchestra/testbench": "~3.6.0 || ~3.7.0 || ~3.8.0 || ~3.9.0 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9 || ^9.x-dev",
     "phpstan/extension-installer": "^1",
     "phpstan/phpstan": "^1",
diff --git a/src/BadRequestGraphQLException.php b/src/BadRequestGraphQLException.php
index 5c77ba4..d94b8e1 100644
--- a/src/BadRequestGraphQLException.php
+++ b/src/BadRequestGraphQLException.php
@@ -4,4 +4,6 @@
 
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
 
-class BadRequestGraphQLException extends BadRequestHttpException {}
+class BadRequestGraphQLException extends BadRequestHttpException
+{
+}
diff --git a/src/RequestParser.php b/src/RequestParser.php
index 1844278..dd4616f 100644
--- a/src/RequestParser.php
+++ b/src/RequestParser.php
@@ -33,7 +33,7 @@ public function __construct()
     public function parseRequest(Request $request)
     {
         $method = $request->getMethod();
-        $bodyParams = $method === 'POST'
+        $bodyParams = 'POST' === $method
             ? $this->bodyParams($request)
             : [];
         /** @var array<string, mixed> $queryParams Laravel type is not precise enough */
@@ -100,7 +100,7 @@ protected function bodyParams(Request $request): array
     protected function inlineFiles(Request $request): array
     {
         $mapParam = $request->post('map');
-        if ($mapParam === null) {
+        if (null === $mapParam) {
             throw new BadMultipartRequestGraphQLException('Missing parameter map.');
         }
         if (! is_string($mapParam)) {
@@ -109,7 +109,7 @@ protected function inlineFiles(Request $request): array
         }
 
         $operationsParam = $request->post('operations');
-        if ($operationsParam === null) {
+        if (null === $operationsParam) {
             throw new BadMultipartRequestGraphQLException('Missing parameter operations.');
         }
         if (! is_string($operationsParam)) {