diff --git a/composer.json b/composer.json
index c7c8228..7bd16f0 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "illuminate/support": "^8|^9"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8|^9"
+        "phpunit/phpunit": ">=8.0.0 <=9.30"
     },
     "license": "MIT",
     "scripts": {