diff --git a/CHANGELOG.md b/CHANGELOG.md
index f989ba0266a4fda67ffb71bc9e900c21a20484ed..9587b18857b4b4fbbaa7b1b6a26146635b9253c9 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] - Date
+
+### Added ###
+
+### Changed ###
+
+### Deprecated ###
+
+### Removed ###
+
+### Fixed ###
+
+### Security ###
+
+### Documentation ###
+
 ## [0.13.2] - 2023-12-15
 
 ### Fixed ###
diff --git a/setup.py b/setup.py
index 55e6ee154e2906494bece48c2f741e53e78aa2fe..12ec4371c9169e15118d0a37f27831d22359ddff 100755
--- a/setup.py
+++ b/setup.py
@@ -46,10 +46,10 @@ from setuptools import find_packages, setup
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ########################################################################
 
-ISRELEASED = True
+ISRELEASED = False
 MAJOR = 0
 MINOR = 13
-MICRO = 2
+MICRO = 3
 # Do not tag as pre-release until this commit
 # https://github.com/pypa/packaging/pull/515
 # has made it into a release. Probably we should wait for pypa/packaging>=21.4
diff --git a/src/doc/conf.py b/src/doc/conf.py
index 84bdc6eac88b345e2b0dd04c5d1f9c413362746b..6604aa6eff4b2bff7b7372b97e57e0f549dd3a50 100644
--- a/src/doc/conf.py
+++ b/src/doc/conf.py
@@ -29,10 +29,10 @@ copyright = '2023, IndiScale GmbH'
 author = 'Daniel Hornung'
 
 # The short X.Y version
-version = '0.13.2'
+version = '0.13.3'
 # The full version, including alpha/beta/rc tags
 # release = '0.5.2-rc2'
-release = '0.13.2'
+release = '0.13.3-dev'
 
 
 # -- General configuration ---------------------------------------------------