diff --git a/composer.json b/composer.json
index 9d7238a..ce855fb 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         "ext-encoding": "self.version"
     },
     "require-dev": {
-        "phpstan/phpstan": "2.1.25",
+        "phpstan/phpstan": "2.1.31",
         "phpunit/phpunit": "^9.0 || ^10.0 || ^11.0 || ^12.0"
     },
     "autoload": {