diff --git a/composer.json b/composer.json
index 18bd604..d4a1bc5 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     "require-dev": {
         "infection/infection": "^0.21.0",
         "phpro/grumphp": "^1.0",
-        "phpstan/phpstan": "^0.12",
+        "phpstan/phpstan": "^0.12 || ^1.0",
         "phpunit/phpunit": "^8.0 || ^9.0",
         "squizlabs/php_codesniffer": "^3.4",
         "symfony/var-dumper": "^4.2 || ^5.0",