diff --git a/composer.json b/composer.json
index 155cfec..c3fefee 100644
--- a/composer.json
+++ b/composer.json
@@ -17,10 +17,10 @@
         "symfony/config": "^5.4 || ^6.2 || ^7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6 || ^10.0"
+        "phpunit/phpunit": "^9.6 || ^10.0 || ^11.0"
     },
     "conflict": {
-        "phpunit/phpunit": "<9.6 || >=11.0"
+        "phpunit/phpunit": "<9.6 || >=12.0"
     },
     "autoload": {
         "psr-4" : { "Matthias\\SymfonyConfigTest\\" : "" },