diff --git a/composer.json b/composer.json
index 2616231..dd12877 100644
--- a/composer.json
+++ b/composer.json
@@ -8,6 +8,9 @@
 	"require": {
 		"typo3/cms-core": "*"
 	},
+	"conflict": {
+		"typo3/cms": "*"
+	},
 	"replace": {
 		"feedit": "*"
 	},