diff --git a/composer.json b/composer.json
index dcbe319..aefa408 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
     "guzzlehttp/psr7": "^1.7 || ^2.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8.0 || ^9.0",
+    "phpunit/phpunit": "^8.0 || ^9.0 || ^11.0",
     "friendsofphp/php-cs-fixer": "^3.5"
   },
   "autoload": {