diff --git a/composer.json b/composer.json
index 8a9c59b..4b92280 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     },
     "require-dev": {
         "phpro/grumphp": "~0.17 || ~1.0",
-        "phpstan/phpstan": "^0.11.5 || ^0.12.0",
+        "phpstan/phpstan": "^0.11.5 || ^0.12.0 || ^1.0.0",
         "phpunit/phpunit": "^8.0 || ^9.0",
         "squizlabs/php_codesniffer": "^3.4",
         "symfony/var-dumper": "^4.2 || ^5.0"