diff --git a/composer.json b/composer.json
index 6829fa2..dc112e1 100644
--- a/composer.json
+++ b/composer.json
@@ -45,7 +45,7 @@
         "laminas/laminas-diactoros": "^2.17",
         "nyholm/psr7": "^1.5",
         "php-http/psr7-integration-tests": "dev-master",
-        "phpstan/phpstan": "^1.8",
+        "phpstan/phpstan": "^1.9",
         "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3.7"
     },