diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5686d3f..b1931b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [4.0.0] - 2019-07-01
+
  * [`changed`]  Return types are now `int16_t` instead of `int8_t` (in line with
                 other embedded drivers).
  * [`changed`]  Functions are now dedicated per sensor (e.g. `sht3x_probe()`
@@ -28,7 +30,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
  * First public release
 
-[Unreleased]: https://github.com/Sensirion/embedded-sht/compare/3.0.0...master
+[Unreleased]: https://github.com/Sensirion/embedded-sht/compare/4.0.0...master
+[4.0.0]: https://github.com/Sensirion/embedded-sht/compare/3.0.0...4.0.0
 [3.0.0]: https://github.com/Sensirion/embedded-sht/compare/2.1.0...3.0.0
 [2.1.0]: https://github.com/Sensirion/embedded-sht/compare/2.0.0...2.1.0
 [2.0.0]: https://github.com/Sensirion/embedded-sht/releases/tag/2.0.0