diff --git a/composer.json b/composer.json
index b4936ed..c77fce7 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
   "require-dev": {
     "franzl/whoops-middleware": "^2.0",
     "phpro/grumphp": "^1.0",
-    "phpstan/phpstan": "^0.12",
+    "phpstan/phpstan": "^1.9",
     "phpunit/phpunit": "^8.0|^9.0",
     "roave/security-advisories": "dev-master",
     "squizlabs/php_codesniffer": "^3.4",