diff --git a/composer.json b/composer.json
index 3f1d016..1a4db71 100644
--- a/composer.json
+++ b/composer.json
@@ -9,9 +9,9 @@
         }
     ],
     "require": {
+        "phpunit/phpunit": "~9.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~9.0",
         "friendsofphp/php-cs-fixer": "^2.14"
     },
     "autoload": {