diff --git a/composer.json b/composer.json
index fed113a..21c1425 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "cdn77/coding-standard": "^7.4",
         "infection/infection": "^0.30.0",
         "phpstan/extension-installer": "^1.1",
-        "phpstan/phpstan": "2.1.20",
+        "phpstan/phpstan": "2.1.21",
         "phpstan/phpstan-phpunit": "2.0.7",
         "phpstan/phpstan-strict-rules": "2.0.6",
         "phpunit/phpunit": "^12.0",