diff --git a/CHANGES.rst b/CHANGES.rst
index 966faaa..c9be138 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@ Changelog
 =========
 
 
+1.0.4 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 1.0.3 (2019-08-26)
 ------------------
 
diff --git a/setup.py b/setup.py
index 6116cc0..20df51e 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 
 setup(
     name='collective.edtf_behavior',
-    version='1.0.3',
+    version='1.0.4.dev0',
     description="A EDTF behavior for Plone.",
     long_description=long_description,
     # Get more from https://pypi.python.org/pypi?%3Aaction=list_classifiers