diff --git a/composer.json b/composer.json
index d958b5b..27bddff 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
     },
     "require-dev": {
         "guzzlehttp/psr7": "1.4",
-        "narrowspark/php-cs-fixer-config": "^2.0",
+        "narrowspark/php-cs-fixer-config": "^2.0 || ^5.0",
         "phpstan/phpstan": "^0.9",
         "phpstan/phpstan-phpunit": "^0.9",
         "phpstan/phpstan-strict-rules": "^0.9.0",