diff --git a/CHANGES.rst b/CHANGES.rst
index ca1d490..0d250dd 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 CHANGES
 *******
 
+1.4 (unreleased)
+================
+
+- Nothing changed yet.
+
+
 1.3 (2019-03-14)
 ================
 
diff --git a/setup.py b/setup.py
index 214631c..684864c 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@ def read(*rnames):
 
 setup(
     name='martian',
-    version='1.3',
+    version='1.4.dev0',
     url='https://github.com/zopefoundation/martian',
     author='Grok project',
     author_email='grok-dev@zope.org',