diff --git a/setup.py b/setup.py
index 05f8fd30e56f3a30787d73c8c4aa8fae1f62c69f..858ba8c9f615961cc54b2c1cbc7df6cf7e290380 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
 #
 ##############################################################################
 
-version = "1.2.2dev"
+version = "1.3.1dev"
 
 import os
 from setuptools import setup, find_packages