diff --git a/composer.json b/composer.json
index 9acaa51..f05c893 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     "symfony/filesystem": "^4 || ^5 || ^6 || ^7"
     },
   "require-dev": {
-    "phpunit/phpunit": "^11.3",
+    "phpunit/phpunit": "^9.5",
     "silverstripe/framework": "^4.10",
     "squizlabs/php_codesniffer": "^3"
   },