diff --git a/CHANGES.rst b/CHANGES.rst
index 2d1dbee..109b071 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+1.3.1 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 1.3 (2016-10-22)
 ----------------
 
diff --git a/setup.py b/setup.py
index 9c85e09..f49df0c 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 from os.path import join
 
-version = '1.3'
+version = '1.3.1.dev0'
 
 readme = open(join('src', 'zope', 'globalrequest', 'README.rst')).read()
 changes = open('CHANGES.rst').read()