diff --git a/CHANGELOG.md b/CHANGELOG.md
index 742552f9..b448e533 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,17 +7,30 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ## [UNRELEASED] - yyyy-mm-dd
 
 ### Added
-- New DB tables
-- v3 api endpoint
 ### Changed
 ### Deprecated
 ### Removed
-- v1 and v2 api endpoints
 ### Fixed
 ### Security
 
 The full changelog can be found [here](https://todo).
 
+## [4.0.0] - 2023-10-06
+
+### Added
+- Support for self-signed certificates ([#203](https://github.com/medizininformatik-initiative/feasibility-backend/issues/203))
+- New DB tables  ([#180](https://github.com/medizininformatik-initiative/feasibility-backend/issues/180))
+- v3 api endpoint ([#190](https://github.com/medizininformatik-initiative/feasibility-backend/issues/190))
+### Changed
+- Ontology is loaded from GitHub ([#201](https://github.com/medizininformatik-initiative/feasibility-backend/issues/201))
+- Error handling changed to provide more information to the GUI  ([#116](https://github.com/medizininformatik-initiative/feasibility-backend/issues/116))
+### Removed
+- v1 and v2 api endpoints ([#190](https://github.com/medizininformatik-initiative/feasibility-backend/issues/190))
+### Security
+- Update Spring Boot to 3.1.3 ([#188](https://github.com/medizininformatik-initiative/feasibility-backend/issues/188))
+
+The full changelog can be found [here](https://github.com/medizininformatik-initiative/feasibility-backend/milestone/6?closed=1).
+
 ## [3.1.3] - 2023-07-13
 
 ### Changed
diff --git a/pom.xml b/pom.xml
index fbe2ab22..19f4aa15 100644
--- a/pom.xml
+++ b/pom.xml
@@ -11,7 +11,7 @@
 
   <groupId>de.medizininformatik-initiative</groupId>
   <artifactId>FeasibilityGuiBackend</artifactId>
-  <version>4.0.0-SNAPSHOT</version>
+  <version>4.1.0-SNAPSHOT</version>
 
   <name>FeasibilityGuiBackend</name>
   <description>Backend of the Feasibility GUI</description>