diff --git a/composer.json b/composer.json
index 1ca9b71..a80bfe3 100644
--- a/composer.json
+++ b/composer.json
@@ -19,6 +19,9 @@
         "contao/rector": "^1.2",
         "phpunit/phpunit": "^11.5"
     },
+    "conflict": {
+        "squizlabs/php_codesniffer": ">=4.0.0"
+    },
     "autoload": {
         "psr-4": {
             "Contao\\EasyCodingStandard\\": "src/"