diff --git a/composer.json b/composer.json
index 0d39efc..dc3bfc6 100644
--- a/composer.json
+++ b/composer.json
@@ -20,11 +20,6 @@
 	"require-dev": {
 		"phpunit/phpunit": "^5.7"
 	},
-	"extra": {
-		"branch-alias": {
-			"dev-master": "2.1.x-dev"
-		}
-	},
 	"autoload": {
 		"psr-4": {
 			"SilverStripe\\SQLite\\": "code/"