diff --git a/CHANGES.txt b/CHANGES.txt
index cba5da2..43c42dd 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+2.13.11 (unreleased)
+--------------------
+
+
 2.13.10 (2016-09-05)
 --------------------
 
diff --git a/setup.py b/setup.py
index bf5d118..f7ace4d 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
 from setuptools import setup, find_packages, Extension
 
 setup(name='Acquisition',
-      version='2.13.10',
+      version='2.13.11.dev0',
       url='http://pypi.python.org/pypi/Acquisition',
       license='ZPL 2.1',
       description="Acquisition is a mechanism that allows objects to obtain "