diff --git a/composer.json b/composer.json
index e97fc04..248d19d 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
   },
   "require-dev": {
     "ergebnis/composer-normalize": "2.28.3",
-    "phpstan/phpstan": "1.8.11",
+    "phpstan/phpstan": "1.9.0",
     "phpunit/phpunit": "9.5.26",
     "roave/security-advisories": "dev-latest"
   },