diff --git a/composer.json b/composer.json
index 48007df18b3d..c1254bf5f583 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "phpunit/phpcov": "^9.0.2 || ^10.0",
         "phpunit/phpunit": "^10.5.16 || ^11.2",
         "predis/predis": "^3.0",
-        "rector/rector": "2.2.14",
+        "rector/rector": "2.3.0",
         "shipmonk/phpstan-baseline-per-identifier": "^2.0"
     },
     "replace": {
diff --git a/utils/src/Rector/UnderscoreToCamelCaseVariableNameRector.php b/utils/src/Rector/UnderscoreToCamelCaseVariableNameRector.php
index 4471bdb7167c..070522314ee3 100644
--- a/utils/src/Rector/UnderscoreToCamelCaseVariableNameRector.php
+++ b/utils/src/Rector/UnderscoreToCamelCaseVariableNameRector.php
@@ -23,7 +23,7 @@
 use PhpParser\Node\Stmt\Namespace_;
 use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory;
 use Rector\Php\ReservedKeywordAnalyzer;
-use Rector\PhpParser\Node\CustomNode\FileWithoutNamespace;
+use Rector\PhpParser\Node\FileNode;
 use Rector\Rector\AbstractRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
 use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
@@ -77,14 +77,19 @@ public function run($aB)
      */
     public function getNodeTypes(): array
     {
-        return [FileWithoutNamespace::class, Namespace_::class];
+        return [FileNode::class, Namespace_::class];
     }
 
     /**
-     * @param ClassMethod|Closure|FileWithoutNamespace|Function_|Namespace_ $node
+     * @param FileNode|Namespace_ $node
      */
     public function refactor(Node $node): ?Node
     {
+        if ($node instanceof FileNode && $node->isNamespaced()) {
+            // handled in Namespace_ node
+            return null;
+        }
+
         if ($node->stmts === null) {
             return null;
         }