diff --git a/composer.json b/composer.json
index be492f0..fb731d7 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,8 @@
     },
     "require":{
         "php":">=5.4",
-        "contao/core":"~3.5"
+        "contao-community-alliance/composer-plugin": "~2.4 | ~3.0",
+        "contao/core-bundle":"~3.5 | ~4.3"
     },
     "suggest": {
         "netzmacht/contao-leaflet-maps": "Leaflet maps integration into Contao CMS"