diff --git a/CHANGELOG.md b/CHANGELOG.md
index da8439c..8502b40 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+
+## [0.4.0] - 2024-11-15
 ### `profirust`
 #### Added
 - Reimplemented the FDL layer for correct multi-master operation.
@@ -85,7 +88,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 Initial Release.
 
 
-[Unreleased]: https://github.com/rahix/profirust/compare/v0.3.0...HEAD
+[Unreleased]: https://github.com/rahix/profirust/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/rahix/profirust/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/rahix/profirust/compare/v0.2.1...v0.3.0
 [0.2.1]: https://github.com/rahix/profirust/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/rahix/profirust/compare/v0.1.1...v0.2.0
diff --git a/Cargo.toml b/Cargo.toml
index 3bf4038..9043716 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "profirust"
-version = "0.2.0"
+version = "0.4.0"
 edition = "2021"
 
 description = "PROFIBUS-DP compatible communication stack in pure Rust"