diff --git a/IPython/html/static/base/js/namespace.js b/IPython/html/static/base/js/namespace.js
index c7602d2df..57612c3a9 100644
--- a/IPython/html/static/base/js/namespace.js
+++ b/IPython/html/static/base/js/namespace.js
@@ -4,7 +4,7 @@
 var IPython = IPython || {};
 define([], function(){
     "use strict";
-    IPython.version = "3.0.0";
+    IPython.version = "3.1.0-dev";
     IPython._target = '_blank';
     return IPython;
 });