diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3bdb31195744cdf38b453e5764f7e6bee37479f2..2e41b4611e97316a25933db6ecaf0c51b79f00be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,20 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased] ##
+
+### Added ###
+
+### Changed ###
+
+### Deprecated ###
+
+### Removed ###
+
+### Fixed ###
+
+### Security ###
+
 ## [5.0.0] - 2021-10-28 ##
 
 ### Added ###
diff --git a/doc/conf.py b/doc/conf.py
index ded9c5b073eab87449686d2ceb27de211bac7a31..c649f342a691a8a52fdf45654925da5b1e378533 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -26,9 +26,9 @@ copyright = '2021, IndiScale GmbH'
 author = 'Daniel Hornung'
 
 # The short X.Y version
-version = '5.0'
+version = '5.1'
 # The full version, including alpha/beta/rc tags
-release = '5.0.0'
+release = '5.1.0-SNAPSHOT'
 
 
 # -- General configuration ---------------------------------------------------