diff --git a/docs/Changelog.md b/docs/Changelog.md
index 255c9bf..fd011f5 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -1,10 +1,14 @@
 
-5.4.9.8 Beta (2021-??-??)
+5.4.9.9 Beta (2021-??-??)
+
+5.4.9.8 Beta (2021-09-05)
 
 - All PowerShell dependencies except the scipt host were
   removed in order to improve Windows 7 compatibility.
 - Fix message box not working when ontop is enabled.
 - Use Vista folder browser.
+- Improved context menu performance.
+- libmpv shinchiro 2021-09-05
 
 
 5.4.9.7 Beta (2021-08-28)
diff --git a/src/Properties/AssemblyInfo.cs b/src/Properties/AssemblyInfo.cs
index 3df36c0..f528d8e 100644
--- a/src/Properties/AssemblyInfo.cs
+++ b/src/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // 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("5.4.9.7")]
-[assembly: AssemblyFileVersion("5.4.9.7")]
+[assembly: AssemblyVersion("5.4.9.8")]
+[assembly: AssemblyFileVersion("5.4.9.8")]