diff --git a/package.json b/package.json
index a14761f5c51..8170092153a 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prebid.js",
-  "version": "1.38.0",
+  "version": "1.39.0-pre",
   "description": "Header Bidding Management Library",
   "main": "src/prebid.js",
   "scripts": {