diff --git a/ReleaseNote.txt b/ReleaseNote.txt
index c924dc8e..4e492f53 100644
--- a/ReleaseNote.txt
+++ b/ReleaseNote.txt
@@ -1,3 +1,11 @@
+==============================================
+    Dynamixel SDK v3.4.4 (Protocol 1.0/2.0)
+==============================================
+
+- 04.26.2017
+
+* hotfix - return delay time is changed from 4 into 8 due to the Ubuntu update 16.04.2
+
 ==============================================
     Dynamixel SDK v3.4.3 (Protocol 1.0/2.0)
 ==============================================
@@ -6,7 +14,6 @@
 
 * DynamixelSDK C++ ver. and ROS ver. in Windows platform now can use the port number of over then 10 #45
 
-
 ==============================================
     Dynamixel SDK v3.4.2 (Protocol 1.0/2.0)
 ==============================================
diff --git a/ros/CHANGELOG.rst b/ros/CHANGELOG.rst
index 49639f5b..4bb37d37 100644
--- a/ros/CHANGELOG.rst
+++ b/ros/CHANGELOG.rst
@@ -2,10 +2,15 @@
 Changelog for package dynamixel_sdk
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+3.4.4 (2017-04-26)
+-----------
+* hotfix - return delay time is changed from 4 into 8 due to the Ubuntu update 16.04.2
+* Contributors: Leon
+
 3.4.3 (2017-02-17)
 -----------
 * DynamixelSDK C++ ver. and ROS ver. in Windows platform now can use the port number of over then 10 #45
-* Contributors: leon
+* Contributors: Leon
 
 3.4.2 (2017-02-16)
 -----------
@@ -15,12 +20,13 @@ Changelog for package dynamixel_sdk
 * build files of windows c and c++ SDK rebuilt by using renewed SDK libraries
 * example source of dxl_monitor - c and cpp ver modified #50
 * Solved issue : #31, #34, #36, #50
-* Contributors: leon
+* Contributors: Leon
 
 3.4.1 (2016-08-22)
 -----------
 * added ROS package folder for ROS users
 * modified original header files for ROS package
+* Contributors: Leon
 
 3.4.0 (2016-08-12)
 -----------
@@ -65,4 +71,4 @@ Changelog for package dynamixel_sdk
 * if the last bulk_read / sync_read result is failure -> GetData return false
 * communication result & rx packet error print function modified.
 * first release
-* Contributors: Leon, ROBOTIS, ROBOTIS-zerom, leon, pyo, sadtale
+* Contributors: Leon, Zerom, Pyo
diff --git a/ros/package.xml b/ros/package.xml
index f3b39e0f..7e8f25d0 100644
--- a/ros/package.xml
+++ b/ros/package.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <package>
   <name>dynamixel_sdk</name>
-  <version>3.4.3</version>
+  <version>3.4.4</version>
   <description>This package is wrapping version of ROBOTIS Dynamxel SDK for ROS. The ROBOTIS Dynamixel SDK, or SDK, is a software development library that provides Dynamixel control functions for packet communication. The API is designed for Dynamixel actuators and Dynamixel-based platforms.</description>
   <license>BSD</license>
   <author email="zerom@robotis.com">Zerom</author>