diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 66fa7de..552cd99 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -57,7 +57,7 @@ jobs:
         with:
           php-version: 8.1
           coverage: none
-          tools: php-cs-fixer:3.21, cs2pr
+          tools: php-cs-fixer:3.92, cs2pr
 
       - name: Display PHP-CS-Fixer version
         run: php-cs-fixer --version
@@ -68,18 +68,18 @@ jobs:
 
   composer-normalize:
     name: Composer Normalize
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.2
+          php-version: 8.1
           coverage: none
           tools: composer-normalize
 
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Normalize
         run: composer-normalize --dry-run
diff --git a/composer.json b/composer.json
index 706819d..54ce7f9 100644
--- a/composer.json
+++ b/composer.json
@@ -17,8 +17,8 @@
     "php": ">=7.4",
     "ext-json": "*",
     "league/fractal": "^0.18 || ^0.19 || ^0.20",
-    "symfony/http-foundation": "^5.4 || ^6.0 || ^7.0",
-    "symfony/validator": "^5.4 || ^6.0 || ^7.0"
+    "symfony/http-foundation": "^5.4 || ^6.0 || ^7.0 || ^8.0",
+    "symfony/validator": "^5.4 || ^6.0 || ^7.0 || ^8.0"
   },
   "require-dev": {
     "nyholm/nsa": "^1.1",
diff --git a/src/ResponseFactory.php b/src/ResponseFactory.php
index 986ee16..cf17148 100644
--- a/src/ResponseFactory.php
+++ b/src/ResponseFactory.php
@@ -23,7 +23,7 @@ final class ResponseFactory
     private $cursor;
     private $contentType;
 
-    public function __construct(Manager $fractal, string $contentType = null)
+    public function __construct(Manager $fractal, ?string $contentType = null)
     {
         $this->fractal = $fractal;
         if (null === $contentType) {