diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64c204a..a7d4543 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0] - 2024-06-04
+
 ### Added
 
 - `SmlReader` type that provides an API for reading, decoding and parsing SML messages from several input sources.
@@ -17,18 +19,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - CI script cleanup
 - Changed `tests/libsml-testing` from submodule to subtree
-
-### Deprecated
-
-### Removed
-
-### Fixed
-
-### Security
-
-### Other
-
 - Updated maintenance badge for 2024
 - Updated hex-literal to 0.4.1
 
-## 0.3.0 - 2023-03-24
\ No newline at end of file
+## 0.3.0 - 2023-03-24
+
+<!-- next-url -->
+[Unreleased]: https://github.com/felixwrt/sml-rs/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/felixwrt/sml-rs/compare/v0.3.0...v0.4.0
\ No newline at end of file
diff --git a/Cargo.toml b/Cargo.toml
index 64e4978..c3f3f6d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@ members = [".", "examples/serialport"]
 
 [package]
 name = "sml-rs"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Felix Wirth <felix@wirth.one>"]
 description = "Smart Message Language (SML) parser written in Rust"
 repository = "https://github.com/felixwrt/sml-rs"