diff --git a/rules-tests/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector/Fixture/also_arrow_function.php.inc b/rules-tests/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector/Fixture/also_arrow_function.php.inc
new file mode 100644
index 00000000000..f5604405706
--- /dev/null
+++ b/rules-tests/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector/Fixture/also_arrow_function.php.inc
@@ -0,0 +1,41 @@
+<?php
+
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Fixture;
+
+use Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Source\SomeTypedService;
+
+final class AlsoArrowFunction
+{
+    public function __construct(
+        private SomeTypedService $someTypedService
+    ) {
+    }
+
+    public function go()
+    {
+        $closure = fn ($value) => $this->someTypedService->run($value);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Fixture;
+
+use Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Source\SomeTypedService;
+
+final class AlsoArrowFunction
+{
+    public function __construct(
+        private SomeTypedService $someTypedService
+    ) {
+    }
+
+    public function go()
+    {
+        $closure = fn (string $value) => $this->someTypedService->run($value);
+    }
+}
+
+?>
diff --git a/rules-tests/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector/Fixture/also_closure.php.inc b/rules-tests/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector/Fixture/also_closure.php.inc
new file mode 100644
index 00000000000..bd270ca8e1d
--- /dev/null
+++ b/rules-tests/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector/Fixture/also_closure.php.inc
@@ -0,0 +1,45 @@
+<?php
+
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Fixture;
+
+use Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Source\SomeTypedService;
+
+final class AlsoClosure
+{
+    public function __construct(
+        private SomeTypedService $someTypedService
+    ) {
+    }
+
+    public function go()
+    {
+        $closure = function ($value) {
+            $this->someTypedService->run($value);
+        };
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Fixture;
+
+use Rector\Tests\TypeDeclaration\Rector\ClassMethod\ParamTypeByMethodCallTypeRector\Source\SomeTypedService;
+
+final class AlsoClosure
+{
+    public function __construct(
+        private SomeTypedService $someTypedService
+    ) {
+    }
+
+    public function go()
+    {
+        $closure = function (string $value) {
+            $this->someTypedService->run($value);
+        };
+    }
+}
+
+?>
diff --git a/rules/TypeDeclaration/NodeAnalyzer/VariableInSprintfMaskMatcher.php b/rules/TypeDeclaration/NodeAnalyzer/VariableInSprintfMaskMatcher.php
index 998e9109751..5c6a54cdbf8 100644
--- a/rules/TypeDeclaration/NodeAnalyzer/VariableInSprintfMaskMatcher.php
+++ b/rules/TypeDeclaration/NodeAnalyzer/VariableInSprintfMaskMatcher.php
@@ -31,7 +31,12 @@ public function __construct(
     public function matchMask(ClassMethod|Function_ $functionLike, string $variableName, string $mask): bool
     {
         $funcCalls = $this->betterNodeFinder->findInstancesOfScoped((array) $functionLike->stmts, FuncCall::class);
-        $funcCalls = array_values(array_filter($funcCalls, fn(FuncCall $funcCall): bool => $this->nodeNameResolver->isName($funcCall->name, 'sprintf')));
+        $funcCalls = array_values(
+            array_filter($funcCalls, fn (FuncCall $funcCall): bool => $this->nodeNameResolver->isName(
+                $funcCall->name,
+                'sprintf'
+            ))
+        );
 
         if (count($funcCalls) !== 1) {
             return false;
diff --git a/rules/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector.php b/rules/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector.php
index 2988d97b9ed..63a5121d382 100644
--- a/rules/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector.php
+++ b/rules/TypeDeclaration/Rector/ClassMethod/ParamTypeByMethodCallTypeRector.php
@@ -5,12 +5,14 @@
 namespace Rector\TypeDeclaration\Rector\ClassMethod;
 
 use PhpParser\Node;
+use PhpParser\Node\Expr\ArrowFunction;
+use PhpParser\Node\Expr\Closure;
 use PhpParser\Node\Expr\FuncCall;
 use PhpParser\Node\Expr\MethodCall;
 use PhpParser\Node\Expr\StaticCall;
 use PhpParser\Node\Param;
-use PhpParser\Node\Stmt\Class_;
 use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\Stmt\Function_;
 use Rector\NodeTypeResolver\Node\AttributeKey;
 use Rector\NodeTypeResolver\PHPStan\Type\TypeFactory;
 use Rector\PhpParser\Node\BetterNodeFinder;
@@ -96,33 +98,25 @@ public function go(string $value)
      */
     public function getNodeTypes(): array
     {
-        return [Class_::class];
+        return [ClassMethod::class, Function_::class, Closure::class, ArrowFunction::class];
     }
 
     /**
-     * @param Class_ $node
+     * @param ClassMethod|Function_|Closure $node
      */
     public function refactor(Node $node): ?Node
     {
-        $hasChanged = false;
-
-        foreach ($node->getMethods() as $classMethod) {
-            if ($this->shouldSkipClassMethod($classMethod)) {
-                continue;
-            }
-
-            /** @var array<StaticCall|MethodCall|FuncCall> $callers */
-            $callers = $this->betterNodeFinder->findInstancesOf(
-                $classMethod,
-                [StaticCall::class, MethodCall::class, FuncCall::class]
-            );
-
-            $hasClassMethodChanged = $this->refactorClassMethod($classMethod, $callers);
-            if ($hasClassMethodChanged) {
-                $hasChanged = true;
-            }
+        if ($node instanceof ClassMethod && $this->shouldSkipClassMethod($node)) {
+            return null;
         }
 
+        /** @var array<StaticCall|MethodCall|FuncCall> $callers */
+        $callers = $this->betterNodeFinder->findInstancesOf(
+            $node,
+            [StaticCall::class, MethodCall::class, FuncCall::class]
+        );
+
+        $hasChanged = $this->refactorFunctionLike($node, $callers);
         if ($hasChanged) {
             return $node;
         }
@@ -139,8 +133,10 @@ private function shouldSkipClassMethod(ClassMethod $classMethod): bool
         return $this->parentClassMethodTypeOverrideGuard->hasParentClassMethod($classMethod);
     }
 
-    private function shouldSkipParam(Param $param, ClassMethod $classMethod): bool
-    {
+    private function shouldSkipParam(
+        Param $param,
+        ClassMethod|Function_|Closure|ArrowFunction $functionLike
+    ): bool {
         // already has type, skip
         if ($param->type instanceof Node) {
             return true;
@@ -150,18 +146,24 @@ private function shouldSkipParam(Param $param, ClassMethod $classMethod): bool
             return true;
         }
 
-        return ! $this->paramTypeAddGuard->isLegal($param, $classMethod);
+        if (! $functionLike instanceof ClassMethod) {
+            return false;
+        }
+
+        return ! $this->paramTypeAddGuard->isLegal($param, $functionLike);
     }
 
     /**
      * @param array<StaticCall|MethodCall|FuncCall> $callers
      */
-    private function refactorClassMethod(ClassMethod $classMethod, array $callers): bool
-    {
+    private function refactorFunctionLike(
+        ClassMethod|Closure|Function_|ArrowFunction $functionLike,
+        array $callers
+    ): bool {
         $hasChanged = false;
 
-        foreach ($classMethod->params as $param) {
-            if ($this->shouldSkipParam($param, $classMethod)) {
+        foreach ($functionLike->params as $param) {
+            if ($this->shouldSkipParam($param, $functionLike)) {
                 continue;
             }
 
diff --git a/src/ChangesReporting/Output/GitHubOutputFormatter.php b/src/ChangesReporting/Output/GitHubOutputFormatter.php
index 8516157d619..56633532276 100644
--- a/src/ChangesReporting/Output/GitHubOutputFormatter.php
+++ b/src/ChangesReporting/Output/GitHubOutputFormatter.php
@@ -131,7 +131,7 @@ private function sanitizeAnnotationProperties(array $annotationProperties): stri
         );
 
         $sanitizedProperties = array_map(
-            fn (string $key, $value): string => sprintf('%s=%s', $key, $this->sanitizeAnnotationProperty($value)),
+            fn (string $key, string|int|null $value): string => sprintf('%s=%s', $key, $this->sanitizeAnnotationProperty($value)),
             array_keys($nonNullProperties),
             $nonNullProperties
         );