diff --git a/composer.json b/composer.json
index 6569a9d5..a4af8182 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
 	"require": {
 		"php": ">=5.3.3",
 		"composer/installers": "^1.0",
-		"aimeos/aimeos-core": "dev-master"
+		"aimeos/aimeos-core": "2017.03.x-dev"
 	},
 	"autoload": {
 		"psr-4": {