diff --git a/composer.json b/composer.json
index 5c572b02..9496f971 100644
--- a/composer.json
+++ b/composer.json
@@ -57,6 +57,9 @@
     "symfony/http-client": "^5.4 || ^6.4 || ^7.3 || ^8.0",
     "symfony/process": "^5.4 || ^6.4 || ^7.3 || ^8.0"
   },
+  "conflict": {
+    "phpstan/phpstan": "2.3.0"
+  },
   "autoload": {
     "psr-4": {
       "Mcp\\": "src/"