diff --git a/composer.json b/composer.json
index ea4aca3..45506c9 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
     "doctrine/annotations": "^1.0 || ^2.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^11.0 || ^10.0",
+    "phpunit/phpunit": "^11.0 || ^10.0 || ^9.0",
     "mockery/mockery": "1.*",
     "orchestra/testbench": "^9.0 || ^8.0 || 7.* || ^6.15 || 5.*",
     "php-coveralls/php-coveralls": "^2.0"