diff --git a/CHANGES.rst b/CHANGES.rst
index a3d6705..2b0a85a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+3.1.1 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 3.1.0 (2018-07-05)
 ------------------
 
diff --git a/setup.py b/setup.py
index 60be227..eeebe87 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 from setuptools import setup
 
 
-version = '3.1.0'
+version = '3.1.1.dev0'
 long_description = (
     open('README.rst').read() + '\n' +
     open('CONTRIBUTORS.rst').read() + '\n' +