diff --git a/composer.json b/composer.json
index b84cb46..70f820c 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "require-dev": {
         "phpunit/phpunit": ">=7",
         "phpmd/phpmd": "2.*",
-        "phpstan/phpstan": "^0.12.88"
+        "phpstan/phpstan": "^0.12.88 || ^1.0.0"
     },
     "autoload": {
         "psr-4": {