diff --git a/CHANGELOG b/CHANGELOG
index 5b9e06d2c..65d50d1e0 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,10 @@
 
 https://openslides.org/
 
+Version 2.1.1 (unreleased)
+==========================
+
+
 Version 2.1 (2017-03-29)
 ========================
 [https://github.com/OpenSlides/OpenSlides/milestones/2.1]
diff --git a/openslides/__init__.py b/openslides/__init__.py
index 068136dad..d5323532a 100644
--- a/openslides/__init__.py
+++ b/openslides/__init__.py
@@ -1,3 +1,3 @@
 __author__ = 'OpenSlides Team <support@openslides.org>'
 __description__ = 'Presentation and assembly system'
-__version__ = '2.1'
+__version__ = '2.1.1-dev'