diff --git a/composer.json b/composer.json
index ee316aa..00df5ad 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "psr/http-message": "^1.0"
     },
     "require-dev": {
-        "phpstan/phpstan": "^0.12.14",
+        "phpstan/phpstan": "^0.12.14 || ^1.0.0",
         "phpunit/phpunit": "^7.5 || ^8.0 || ^9.0",
         "squizlabs/php_codesniffer": "^3.5"
     },