diff --git a/composer.json b/composer.json
index fa9eb0ee..ff487242 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
         "phpstan/phpstan": "^2.1.8",
         "phpstan/phpstan-webmozart-assert": "^2.0",
         "phpunit/phpunit": "^11.4",
-        "rector/rector-src": "dev-main",
+        "rector/rector-src": "dev-fix-to-string",
         "symplify/easy-coding-standard": "^12.3",
         "symplify/rule-doc-generator": "^12.2",
         "symplify/vendor-patches": "^11.3",
diff --git a/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/skip_parent_mixed_return.php.inc b/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/skip_parent_mixed_return.php.inc
new file mode 100644
index 00000000..c9f5c2f0
--- /dev/null
+++ b/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/skip_parent_mixed_return.php.inc
@@ -0,0 +1,13 @@
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Fixture;
+
+use Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Source\ParentClassWithToStringMixedReturn;
+
+class SkipParentMixedReturn extends ParentClassWithToStringMixedReturn
+{
+    public function __toString()
+    {
+        return 'value';
+    }
+}
diff --git a/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/with_parent_mixed_return.php.inc b/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/with_parent_mixed_return.php.inc
deleted file mode 100644
index ae372f95..00000000
--- a/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/with_parent_mixed_return.php.inc
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-namespace Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Fixture;
-
-use Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Source\ParentClassWithToStringMixedReturn;
-
-// @see https://3v4l.org/IrE2q#v7.4.33
-class WithParentMixedReturn extends ParentClassWithToStringMixedReturn
-{
-    public function __toString()
-    {
-        return 'value';
-    }
-}
-
-?>
------
-<?php
-
-namespace Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Fixture;
-
-use Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Source\ParentClassWithToStringMixedReturn;
-
-// @see https://3v4l.org/IrE2q#v7.4.33
-class WithParentMixedReturn extends ParentClassWithToStringMixedReturn
-{
-    public function __toString(): string
-    {
-        return 'value';
-    }
-}
-
-?>