diff --git a/CHANGELOG.md b/CHANGELOG.md
index 782b20e..fd51d79 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 <!-- next-header -->
 ## [Unreleased] - ReleaseDate
+## [0.4.0] - 2021-08-04
 
 ### Added
 - `AsRef`, `AsMut`, `Hash`, `Ord`, `PartialOrd` impl for BoundedVec;
@@ -28,7 +29,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - initial `BoundedVec` implementation including `mapped()`, `first()`, `last()`, to/from array/`Vec`;
 
 <!-- next-url -->
-[Unreleased]: https://github.com/ergoplatform/bounded-vec/compare/v0.3.0...HEAD
+[Unreleased]: https://github.com/ergoplatform/bounded-vec/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/ergoplatform/bounded-vec/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/ergoplatform/bounded-vec/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/ergoplatform/bounded-vec/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/ergoplatform/bounded-vec/compare/v0.0.0...v0.1.0
diff --git a/Cargo.toml b/Cargo.toml
index 41649c1..747ade0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "bounded-vec"
-version = "0.3.0"
+version = "0.4.0"
 license = "CC0-1.0"
 authors = ["Denys Zadorozhnyi <denys@zadorozhnyi.com>"]
 edition = "2018"