diff --git a/composer.json b/composer.json
index a3a630a..0b38579 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
   },
   "require-dev": {
     "friendsofphp/php-cs-fixer": "^2.15|^3.6",
-    "phpunit/phpunit": "^9"
+    "phpunit/phpunit": "^13"
   },
   "autoload": {
     "psr-4": {