diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index fdb4fa6..c1ab6a4 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -4,14 +4,16 @@
 
 use PedroTroller\CS\Fixer\Fixers;
 use PedroTroller\CS\Fixer\RuleSetFactory;
+use PhpCsFixer\Config;
+use PhpCsFixer\Finder;
 
-return (new PhpCsFixer\Config())
+return (new Config())
     ->setRiskyAllowed(true)
     ->setRules(
         RuleSetFactory::create()
             ->per(2, true)
             ->phpCsFixer(true)
-            ->php(8.0, true)
+            ->php(8.1, true)
             ->pedrotroller(true)
             ->enable('align_multiline_comment')
             ->enable('array_indentation')
@@ -34,7 +36,7 @@
     ->setUsingCache(false)
     ->registerCustomFixers(new Fixers())
     ->setFinder(
-        PhpCsFixer\Finder::create()
+        Finder::create()
             ->in(__DIR__)
             ->append([__FILE__, __DIR__.'/bin/doc'])
     )
diff --git a/bin/Utils.php b/bin/Utils.php
index 913820e..b21abba 100644
--- a/bin/Utils.php
+++ b/bin/Utils.php
@@ -4,7 +4,7 @@
 
 final class Utils
 {
-    public static function arrayToString(array $array = null)
+    public static function arrayToString(?array $array = null)
     {
         if (null === $array) {
             return;
diff --git a/bin/doc b/bin/doc
index 09dd9df..3c8887a 100755
--- a/bin/doc
+++ b/bin/doc
@@ -1,7 +1,10 @@
 #!/usr/bin/env php
 <?php
 
+declare(strict_types=1);
+
 use PedroTroller\CS\Fixer\AbstractFixer;
+use PedroTroller\CS\Fixer\Fixers;
 use PhpCsFixer\Fixer\ConfigurableFixerInterface;
 use PhpCsFixer\FixerConfiguration\FixerOptionInterface;
 use PhpCsFixer\FixerDefinition\CodeSample;
@@ -80,7 +83,7 @@ $fixers = array_map(static function (AbstractFixer $fixer) {
             ];
         }, $samples),
     ];
-}, iterator_to_array(new PedroTroller\CS\Fixer\Fixers()));
+}, ...(new Fixers()));
 
 $loader = new FilesystemLoader([__DIR__]);
 $twig   = new Environment($loader);
diff --git a/composer.json b/composer.json
index 6815fc0..50fdc43 100644
--- a/composer.json
+++ b/composer.json
@@ -3,10 +3,10 @@
     "description": "PHP-CS-FIXER : my custom fixers",
     "license": "MIT",
     "require": {
-        "php": "^8.0"
+        "php": "^8.1",
+        "friendsofphp/php-cs-fixer": ">=3.59.3"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^3.28",
         "phpspec/phpspec": "^7.0",
         "sebastian/diff": "^4.0",
         "twig/twig": "^3.3",
diff --git a/src/PedroTroller/CS/Fixer/AbstractFixer.php b/src/PedroTroller/CS/Fixer/AbstractFixer.php
index 549e599..d2d8b74 100644
--- a/src/PedroTroller/CS/Fixer/AbstractFixer.php
+++ b/src/PedroTroller/CS/Fixer/AbstractFixer.php
@@ -45,7 +45,7 @@ public function getDefinition(): FixerDefinitionInterface
         return new FixerDefinition(
             $this->getDocumentation(),
             array_map(
-                fn (array $configutation = null) => new CodeSample($this->getSampleCode(), $configutation),
+                fn (?array $configutation = null) => new CodeSample($this->getSampleCode(), $configutation),
                 $this->getSampleConfigurations()
             )
         );
diff --git a/src/PedroTroller/CS/Fixer/RuleSetFactory.php b/src/PedroTroller/CS/Fixer/RuleSetFactory.php
index 6e75b76..dc2d0d9 100644
--- a/src/PedroTroller/CS/Fixer/RuleSetFactory.php
+++ b/src/PedroTroller/CS/Fixer/RuleSetFactory.php
@@ -55,7 +55,7 @@ public static function create(array $rules = []): self
         );
     }
 
-    public function per(int|float $version = null, bool $risky = false): self
+    public function per(null|float|int $version = null, bool $risky = false): self
     {
         $candidates = null !== $version
             ? ['@PER-CS'.number_format($version, 1, '.', '')]
@@ -198,7 +198,7 @@ public function pedrotroller(bool $risky = false): self
         ));
     }
 
-    public function enable(string $name, array $config = null): self
+    public function enable(string $name, ?array $config = null): self
     {
         return self::create(array_merge(
             $this->rules,
diff --git a/tests/TokensAnalyzerIntegration/MethodArguments.php b/tests/TokensAnalyzerIntegration/MethodArguments.php
index c307cbe..872a4a4 100644
--- a/tests/TokensAnalyzerIntegration/MethodArguments.php
+++ b/tests/TokensAnalyzerIntegration/MethodArguments.php
@@ -67,7 +67,7 @@ public function assertions(TokensAnalyzer $analyzer, Tokens $tokens): void
             $arguments,
             [
                 ($theFunction + 5) => [
-                    'type'      => 'Domain\\Model\\User',
+                    'type'      => 'Domain\Model\User',
                     'name'      => '$user',
                     'nullable'  => false,
                     'asDefault' => false,