diff --git a/nbclassic/static/base/js/namespace.js b/nbclassic/static/base/js/namespace.js
index c11a8bf3f..a791249f4 100644
--- a/nbclassic/static/base/js/namespace.js
+++ b/nbclassic/static/base/js/namespace.js
@@ -73,7 +73,7 @@ define(function(){
     // tree
     jglobal('SessionList','tree/js/sessionlist');
 
-    Jupyter.version = "0.5.4";
+    Jupyter.version = "0.6.0.dev0";
     Jupyter._target = '_blank';
 
     return Jupyter;