diff --git a/bower.json b/bower.json
index 23add6e2..99167912 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "vis",
-  "version": "0.3.0",
+  "version": "0.4.0-SNAPSHOT",
   "description": "A dynamic, browser-based visualization library.",
   "homepage": "http://visjs.org/",
   "repository": {
diff --git a/package.json b/package.json
index f596d1ba..1998f1c9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vis",
-  "version": "0.3.0",
+  "version": "0.4.0-SNAPSHOT",
   "description": "A dynamic, browser-based visualization library.",
   "homepage": "http://visjs.org/",
   "repository": {