diff --git a/composer.json b/composer.json
index 079f392..7f84f0f 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
     "laminas/laminas-diactoros": "^2.3",
     "nyholm/psr7": "^1.3",
     "php-http/psr7-integration-tests": "dev-master",
-    "phpstan/phpstan": "^0.12.37",
+    "phpstan/phpstan": "^0.12.40",
     "phpunit/phpunit": "^8.5",
     "squizlabs/php_codesniffer": "^3.5"
   },