diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc2563a..55257b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,18 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
-[Unreleased]: https://github.com/althonos/blanket/compare/v0.3.0...HEAD
+[Unreleased]: https://github.com/althonos/blanket/compare/v0.4.0...HEAD
+
+
+## [v0.4.0]: https://github.com/althonos/blanket/compare/v0.3.0...v0.4.0
+
+### Added
+- Support for associated functions in traits ([#12](https://github.com/althonos/blanket/issues/12)).
+- Support for `async` methods ([#11](https://github.com/althonos/blanket/issues/11)).
+- Partial support for deriving trait for `Cow`.
+
+### Changed
+- Refactored internal code to share deriving code between all supported types.
 
 
 ## [v0.3.0] - 2023-06-19
@@ -22,7 +33,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `#[blanket(default = ...)]` now also accepts a path instead of a string literal.
 
 
-
 ## [v0.2.0] - 2021-05-06
 
 [v0.2.0]: https://github.com/althonos/blanket/compare/v0.1.5...v0.2.0
diff --git a/Cargo.toml b/Cargo.toml
index bc68ba8..c240db6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "blanket"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Martin Larralde <martin.larralde@embl.de>"]
 edition = "2018"
 resolver = "2"