diff --git a/HISTORY.md b/HISTORY.md
index c6a4f323..5cabd697 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,10 @@
 http://visjs.org
 
 
+## not yet released, version 4.13.1-SNAPSHOT
+
+
+
 ## 2016-02-01, version 4.13.0
 
 ### Network
diff --git a/package.json b/package.json
index 1554acf8..41a8c326 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vis",
-  "version": "4.13.0",
+  "version": "4.13.1-SNAPSHOT",
   "description": "A dynamic, browser-based visualization library.",
   "homepage": "http://visjs.org/",
   "license": "(Apache-2.0 OR MIT)",