diff --git a/package-lock.json b/package-lock.json
index 664cd7eebfc..84e5b08ea80 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "prebid.js",
-  "version": "2.39.0",
+  "version": "2.40.0-pre",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 8562aaa439b..00e47b4c312 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prebid.js",
-  "version": "2.39.0",
+  "version": "2.40.0-pre",
   "description": "Header Bidding Management Library",
   "main": "src/prebid.js",
   "scripts": {