diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8b10b70..92112c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+...
+
+## [0.4.0] - 2021-05-22
+
 ### Changed
 - [breaking-change] Return `Error::InvalidDeviceState` if it was not possible to read the
   date and/or time from the device because the state of the device corresponds to
@@ -64,7 +68,8 @@ this CHANGELOG.
 [`chrono`]: https://crates.io/crates/chrono
 [`rtcc`]: https://crates.io/crates/rtcc
 
-[Unreleased]: https://github.com/eldruin/ds323x-rs/compare/v0.3.2...HEAD
+[Unreleased]: https://github.com/eldruin/ds323x-rs/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/eldruin/ds323x-rs/compare/v0.3.2...v0.4.0
 [0.3.2]: https://github.com/eldruin/ds323x-rs/compare/v0.3.1...v0.3.2
 [0.3.1]: https://github.com/eldruin/ds323x-rs/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/eldruin/ds323x-rs/compare/v0.2.0...v0.3.0
diff --git a/Cargo.toml b/Cargo.toml
index 30ba1b4..173de60 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ds323x"
-version = "0.3.2" # remember to update html_root_url
+version = "0.4.0" # remember to update html_root_url
 authors = ["Diego Barrios Romero <eldruin@gmail.com>"]
 repository = "https://github.com/eldruin/ds323x-rs"
 license = "MIT OR Apache-2.0"
diff --git a/src/lib.rs b/src/lib.rs
index ad2c580..66822bc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -386,7 +386,7 @@
 //! rtc.set_alarm1_hms(time).unwrap();
 //! ```
 
-#![doc(html_root_url = "https://docs.rs/ds323x/0.3.2")]
+#![doc(html_root_url = "https://docs.rs/ds323x/0.4.0")]
 #![deny(unsafe_code, missing_docs)]
 #![no_std]