diff --git a/CHANGES.txt b/CHANGES.txt
index 56ed2a2..bf161af 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -2,6 +2,11 @@
 CHANGES
 =======
 
+1.0.0 (unreleased)
+------------------
+
+- Nothing yet.
+
 0.9.1 (2010-06-22)
 ------------------
 
diff --git a/setup.py b/setup.py
index 16fef6d..f5e62db 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ def read(*rnames):
 
 setup (
     name='z3c.rml',
-    version='0.9.1',
+    version='1.0.0dev',
     author = "Stephan Richter and the Zope Community",
     author_email = "zope-dev@zope.org",
     description = "An alternative implementation of RML",