diff --git a/composer.json b/composer.json
index 40922f23..4b44afb7 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,7 @@
         "phpunit/phpunit": "^11.3.3"
     },
     "conflict": {
+        "phpunit/phpunit": ">11.3.3",
         "sebastian/exporter": "<6.0.0",
         "webmozart/assert": "<1.11.0"
     },