diff --git a/.gitignore b/.gitignore
index 3d1800d..7cb305f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ src/*.egg-info
 bin
 build
 develop-eggs
+dist/
 lib/
 parts
 default.profraw
diff --git a/CHANGES.rst b/CHANGES.rst
index 9d8b893..5a4f217 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,10 @@
  Changes
 =========
 
+5.1.1 (unreleased)
+==================
+
+
 5.1 (2020-07-06)
 ================
 
diff --git a/setup.py b/setup.py
index d7cac09..f097d07 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@ def read(*rnames):
 
 setup(
     name='zope.tales',
-    version='5.1',
+    version='5.1.1.dev0',
     author='Zope Foundation and Contributors',
     author_email='zope-dev@zope.org',
     description='Zope Template Application Language Expression Syntax '