diff --git a/package.json b/package.json
index 9e12dda1708..d029a0b80b0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prebid.js",
-  "version": "6.3.0",
+  "version": "6.4.0-pre",
   "description": "Header Bidding Management Library",
   "main": "src/prebid.js",
   "scripts": {