diff --git a/composer.json b/composer.json
index 60d77bb6..b7ca5652 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "fzaninotto/faker": "^1.9",
         "mockery/mockery": "^1.3.1",
         "nunomaduro/collision": "^4.1",
-        "phpunit/phpunit": "^8.5|^9.0"
+        "phpunit/phpunit": "^8.5"
     },
     "config": {
         "optimize-autoloader": true,