diff --git a/app/build.gradle b/app/build.gradle
index 98de360e..465bf0a2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 27
-    buildToolsVersion '27.0.1'
+    buildToolsVersion '27.0.2'
     defaultConfig {
         applicationId "com.sendbird.android.sample"
         minSdkVersion 14
diff --git a/app/src/main/java/com/sendbird/android/sample/groupchannel/GroupChannelListFragment.java b/app/src/main/java/com/sendbird/android/sample/groupchannel/GroupChannelListFragment.java
index 230716b6..a4fee2d5 100644
--- a/app/src/main/java/com/sendbird/android/sample/groupchannel/GroupChannelListFragment.java
+++ b/app/src/main/java/com/sendbird/android/sample/groupchannel/GroupChannelListFragment.java
@@ -117,6 +117,7 @@ public void onChannelChanged(BaseChannel channel) {
 
             @Override
             public void onTypingStatusUpdated(GroupChannel channel) {
+                mChannelListAdapter.clearMap();
                 mChannelListAdapter.notifyDataSetChanged();
             }
         });