diff --git a/composer.json b/composer.json
index 6a0e3f4..c3cf209 100644
--- a/composer.json
+++ b/composer.json
@@ -55,7 +55,7 @@
 	},
 	"extra": {
 		"branch-alias": {
-			"dev-master": "3.x-dev"
+			"dev-master": "4.x-dev"
 		}
 	},
 	"autoload": {
diff --git a/extension.json b/extension.json
index e2a41fb..b84e642 100644
--- a/extension.json
+++ b/extension.json
@@ -1,6 +1,6 @@
 {
 	"name": "SemanticExtraSpecialProperties",
-	"version": "3.0.5",
+	"version": "4.0.0-beta",
 	"author": [
 		"Leo Wallentin",
         "James Hong Kong",