REL: Begin next release cycle

CHANGELOG.md

@@ -4,6 +4,22 @@ 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 ###
+
 ## [0.12.0] - 2023-07-07 ##
 
 ### Added ###

src/doc/conf.py

@@ -26,9 +26,9 @@ copyright = '2022, IndiScale GmbH'
 author = 'Daniel Hornung'
 
 # The short X.Y version
-version = '0.12.0'
+version = '0.12.1'
 # The full version, including alpha/beta/rc tags
-release = '0.12.0'
+release = '0.12.1-SNAPSHOT'
 
 
 # -- General configuration ---------------------------------------------------