diff --git a/HISTORY.md b/HISTORY.md
index 7a118e05..6b3bb020 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,12 @@
 http://visjs.org
 
 
+## not yet released, version 4.15.2-SNAPSHOT
+
+
+
+
+
 ## 2016-03-08, version 4.15.1
 
 ## General
diff --git a/package.json b/package.json
index 79522316..c1e62779 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vis",
-  "version": "4.15.1",
+  "version": "4.15.2-SNAPSHOT",
   "description": "A dynamic, browser-based visualization library.",
   "homepage": "http://visjs.org/",
   "license": "(Apache-2.0 OR MIT)",