diff --git a/.castor/qa.php b/.castor/qa.php
index 0ff10df..eb10b45 100644
--- a/.castor/qa.php
+++ b/.castor/qa.php
@@ -32,20 +32,19 @@ function all(): void
 function install(?string $only = null): void
 {
     $map = [
-        'php-cs-fixer' => fn() => run('composer install --working-dir tools/php-cs-fixer'),
-        'phpstan' => fn() => run('composer install --working-dir tools/phpstan'),
-        'phpunit' => fn() => run('composer install --working-dir tools/phpunit'),
-        'rector' => fn() => run('composer install --working-dir tools/rector'),
+        'php-cs-fixer' => fn () => run('composer install --working-dir tools/php-cs-fixer'),
+        'phpstan' => fn () => run('composer install --working-dir tools/phpstan'),
+        'phpunit' => fn () => run('composer install --working-dir tools/phpunit'),
+        'rector' => fn () => run('composer install --working-dir tools/rector'),
     ];
 
     if ($only) {
-        $map = array_filter($map, fn($key) => $key === $only, ARRAY_FILTER_USE_KEY);
+        $map = array_filter($map, fn ($key) => $key === $only, \ARRAY_FILTER_USE_KEY);
     }
 
     foreach ($map as $task) {
         $task();
     }
-
 }
 
 #[AsTask(description: 'Fix coding standards', aliases: ['cs'])]
diff --git a/src/MarkdownFixer.php b/src/MarkdownFixer.php
index 7291289..f274497 100644
--- a/src/MarkdownFixer.php
+++ b/src/MarkdownFixer.php
@@ -33,8 +33,8 @@ class MarkdownFixer
     private readonly MarkdownRenderer $markdownRenderer;
 
     public function __construct(
-        Environment $environment = null,
-        LoggerInterface $logger = null,
+        ?Environment $environment = null,
+        ?LoggerInterface $logger = null,
     ) {
         if (null === $environment) {
             $environment = new Environment();