diff --git a/README.md b/README.md
index 192b699..8d62412 100644
--- a/README.md
+++ b/README.md
@@ -36,4 +36,4 @@ public async void btn_OnClick()
 
 License
 -------
-Copyright (c) 2014 @jsakamoto. Licensed under the MIT license.
+Copyright (c) 2014-2018 @jsakamoto. Licensed under the MIT license.
diff --git a/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs b/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs
index a6e4603..809a256 100644
--- a/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs
+++ b/VoiceTextWebAPI.Client/Properties/AssemblyInfo.cs
@@ -10,7 +10,7 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("")]
 [assembly: AssemblyProduct(".NET Client for VoiceText Web API")]
-[assembly: AssemblyCopyright("Copyright © J.Sakamoto 2014-2015, MIT License")]
+[assembly: AssemblyCopyright("Copyright © J.Sakamoto 2014-2018, MIT License")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
@@ -32,4 +32,4 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.3.0.1")]
+[assembly: AssemblyVersion("1.4.0.0")]
diff --git a/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec b/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec
index 188eacf..0c00612 100644
--- a/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec
+++ b/VoiceTextWebAPI.Client/VoiceTextWebAPI.Client.nuspec
@@ -18,6 +18,8 @@
     </description>
     <releaseNotes>
       <![CDATA[
+      v.1.4
+      - Add mp3 format.
       v.1.3
       - Can chose voice file format from wav/ogg/aac.
       v.1.2