diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e00bab7e7b87767394e6321aff4e6840c23ca5d..dca09823d83e215c7e5b9e9a491e4940b99b53d5 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
+
 ## [v0.4.0] - 2021-06-21
 
 ### Added
diff --git a/pom.xml b/pom.xml
index ef49fea396cbc5f3ca3b9fe5c73468675238ff68..7fece112f6b7bff37e0f8b8afdab0579e073a842 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.caosdb</groupId>
   <artifactId>caosdb-server</artifactId>
-  <version>0.4.0</version>
+  <version>0.5.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>CaosDB Server</name>
   <properties>
diff --git a/src/doc/conf.py b/src/doc/conf.py
index ed8a54df98eb3e88414c3030856a360943d1229d..123f7ac9957da11252da6a7594885e6b69d2240a 100644
--- a/src/doc/conf.py
+++ b/src/doc/conf.py
@@ -25,9 +25,9 @@ copyright = '2020, IndiScale GmbH'
 author = 'Daniel Hornung'
 
 # The short X.Y version
-version = '0.4'
+version = '0.5'
 # The full version, including alpha/beta/rc tags
-release = '0.4.0'
+release = '0.5.0-SNAPSHOT'
 
 
 # -- General configuration ---------------------------------------------------