diff --git a/CHANGELOG.md b/CHANGELOG.md
index d610745e..82875360 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGE LOG
 
+## v.4.9.1
+
+- **NEW** Add `merchant_advice` param to charge model ([#166](https://github.com/omise/omise-java/pull/166))
+
 ## v.4.9.0
 
 - **NEW** Support wechat_pay source ([#164](https://github.com/omise/omise-java/pull/164))
diff --git a/build.gradle b/build.gradle
index a4134d8d..fd0a898d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ apply plugin: 'com.github.johnrengelman.shadow'
 apply plugin: 'com.github.ben-manes.versions'
 
 group 'co.omise'
-version '4.9.0'
+version '4.9.1'
 
 sourceCompatibility = 1.8
 targetCompatibility = 1.8