diff --git a/CHANGES.txt b/CHANGES.txt
index 6c32705..b841e32 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+2.12.1 - unreleased
+-------------------
+
+
 2.12.0 - 2010-09-25
 -------------------
 
diff --git a/setup.py b/setup.py
index d95cb95..4a065d6 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
                    file("CHANGES.txt").read()
 
 setup(name='tempstorage',
-      version = '2.12.0',
+      version = '2.12.1dev',
       url='http://pypi.python.org/pypi/tempstorage',
       license='ZPL 2.1',
       description='A RAM-based storage for ZODB',