diff --git a/README.md b/README.md
index ecb2d565..e246fa44 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ Qiscus Chat SDK requires minimum Android API 16 (Jelly Bean). To integrate your
 allprojects { 
       repositories { 
            ... 
-           maven { url "https://dl.bintray.com/qiscustech/maven" } 
+           maven { url "https://artifactory.qiscus.com/artifactory/qiscus-library-open-source" } 
       } 
 }
 ```
@@ -54,7 +54,7 @@ Second, you need to add SDK dependencies inside your app .gradle. Then, you need
 ```
 dependencies { 
        ... 
-       implementation 'com.qiscus.sdk:chat-core:1.3.27'
+       implementation 'com.qiscus.sdk:chat-core:1.3.28'
 }
 ```
 
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 35250a9a..b700bdc6 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -95,4 +95,9 @@
 -keep class org.eclipse.paho.client.mqttv3.*$* { *; }
 -keep class org.eclipse.paho.client.mqttv3.logging.JSR47Logger {
     *;
-}
\ No newline at end of file
+}
+
+#Model data
+-keep class com.qiscus.sdk.chat.core.data.model.** {
+    *;
+}