diff --git a/composer.json b/composer.json
index 1616901..38536d6 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
         "php-64bit": "*"
     },
     "require-dev": {
-        "phpstan/phpstan": "0.12.39",
+        "phpstan/phpstan": "0.12.40",
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan-strict-rules": "^0.12.4"
     },