diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a3e11d..108aaea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 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
+
+### Fixed
+- Sample size for type RH_CO2_ALT resp Sample type 2 changed from 6 to 8 Bytes as specified in 
+  https://github.com/Sensirion/arduino-ble-gadget/blob/master/documents/00-Sensirion_BLE_communication_protocol.pdf
+
 ## [0.3.0] - Breaking Changes
 
 ### Added
diff --git a/library.properties b/library.properties
index a4f4423..4334cd8 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Sensirion UPT Core
-version=0.3.0
+version=0.3.1
 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.