diff --git a/CHANGELOG.md b/CHANGELOG.md
index 49f2802..dc1dece 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+
+## [0.4.0] - 2024-07-25
+
+### Added
 - Added SEN66 to sensor types
 
 ## [0.3.2] - 2024-06-19
diff --git a/library.properties b/library.properties
index fd4b4d7..4d6c310 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Sensirion UPT Core
-version=0.3.2
+version=0.4.0
 author=Jonas Stolle, Maximilian Paulsen
 maintainer=Sensirion AG <sensirion.com>
 sentence=Library for definitions and configurations used by other Sensirion Unified Prototyping Toolkit (UPT) libraries.