diff --git a/CHANGES.rst b/CHANGES.rst
index 4dcfc6a..ef811be 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,9 @@
+Version 2.1.1
+-------------
+
+Unreleased
+
+
 Version 2.1.0
 -------------
 
diff --git a/src/itsdangerous/__init__.py b/src/itsdangerous/__init__.py
index 1225447..67057d8 100644
--- a/src/itsdangerous/__init__.py
+++ b/src/itsdangerous/__init__.py
@@ -16,4 +16,4 @@
 from .url_safe import URLSafeSerializer as URLSafeSerializer
 from .url_safe import URLSafeTimedSerializer as URLSafeTimedSerializer
 
-__version__ = "2.1.0"
+__version__ = "2.1.1.dev0"