diff --git a/composer.json b/composer.json
index 29bdd5b..5035623 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "roave/security-advisories": "dev-master"
     },
     "require-dev": {
-        "phpunit/phpunit": "4.3.*"
+        "phpunit/phpunit": "11.1.*"
     },
     "autoload": {
         "psr-4": {