diff --git a/cookiecutter/__init__.py b/cookiecutter/__init__.py
index 1075a8418..88fb2f6e7 100644
--- a/cookiecutter/__init__.py
+++ b/cookiecutter/__init__.py
@@ -1,2 +1,2 @@
 """Main package for Cookiecutter."""
-__version__ = "2.1.0"
+__version__ = "2.1.1.dev0"
diff --git a/setup.py b/setup.py
index 5cd1729bc..907b0307f 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 """cookiecutter distutils configuration."""
 from setuptools import setup
 
-version = "2.1.0"
+version = "2.1.1.dev0"
 
 with open('README.md', encoding='utf-8') as readme_file:
     readme = readme_file.read()