diff --git a/Changelog.md b/Changelog.md
index a9085fa..828a798 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## master (unreleased)
+
+Nothing here yet.
+
 ## v8.4.0 (2020-04-17)
 
 ### New Calendar
diff --git a/setup.py b/setup.py
index 992a41d..b36220b 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@ REQUIREMENTS = [
     'pyluach',
     'setuptools>=1.0',
 ]
-version = '8.4.0'
+version = '8.5.0.dev0'
 __VERSION__ = version
 
 params = dict(