diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3567f09ce83e8e25452e6a71e1af54be2735a2ae..d8101a5439db6c78dcdeed2a93b7735bac324c65 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,22 @@ 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 ###
+
+### Documentation ###
+
 ## [0.9.0] - 2023-01-19
 
 ### Added
diff --git a/pom.xml b/pom.xml
index ea47a9e516122019c06146a61538b5957d1d5b0f..b251820a27733901e47012ecc9b9a4fb682b0229 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>0.9.0</version>
+  <version>0.9.1-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>CaosDB Server</name>
   <scm>
diff --git a/src/doc/conf.py b/src/doc/conf.py
index b0c958c03bbb23b9642a36f91a4d62cbe373f6e6..c7ff480a90f6d8d7aca14bd61bfcc4afc8d79c6b 100644
--- a/src/doc/conf.py
+++ b/src/doc/conf.py
@@ -25,9 +25,9 @@ copyright = '2022, IndiScale GmbH'
 author = 'Daniel Hornung, Timm Fitschen'
 
 # The short X.Y version
-version = '0.9.0'
+version = '0.9.1'
 # The full version, including alpha/beta/rc tags
-release = '0.9.0'
+release = '0.9.1-SNAPSHOT'
 
 
 # -- General configuration ---------------------------------------------------