diff --git a/composer.json b/composer.json
index 2c7035829..6a4e9ed88 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
   },
   "require-dev": {
     "squizlabs/php_codesniffer": "^3.0.0",
-    "phpunit/phpunit": "^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0 || ^9.0.0"
+    "phpunit/phpunit": "^13.4.5"
   },
   "require": {
     "php": "^5.6 || ^7.0 || ^8.0",