diff --git a/nuget/BlurWindow.nuspec b/nuget/BlurWindow.nuspec
index 946b825..2cff2a3 100644
--- a/nuget/BlurWindow.nuspec
+++ b/nuget/BlurWindow.nuspec
@@ -3,7 +3,7 @@
   <metadata>
     <id>BlurWindow</id>
     <title>BlurWindow</title>
-    <version>6.1.0</version>
+    <version>7.0.0</version>
     <authors>ZTI</authors>
     <projectUrl>https://github.com/TianXiaTech/BlurWindow</projectUrl>
     <icon>icon.png</icon>
@@ -21,6 +21,7 @@ Features:
     - enable/disable context menu 
     - control box visibility
     - content span
+    - blur background
     </description>
 	<releaseNotes>Add ContentSpan</releaseNotes>
 	<copyright>Copyright ©2023 ZTI</copyright>
diff --git a/nuget/README.md b/nuget/README.md
index f81538c..4d2f612 100644
--- a/nuget/README.md
+++ b/nuget/README.md
@@ -87,12 +87,17 @@ Specify background transparency
         CloseVisibility = Visibility.Collapsed
 ```
 
-## New feature
 **ContentSpan** 
 ```
         ContentSpan="true"
 ```
 
+## New feature
+**IsBlurBackground** 
+```
+        IsBlurBackground="true"
+```
+
 ## License
 
 [MIT License](LICENSE).
diff --git a/nuget/lib/net45/BlurWindow.dll b/nuget/lib/net45/BlurWindow.dll
index b557c1b..e251014 100644
Binary files a/nuget/lib/net45/BlurWindow.dll and b/nuget/lib/net45/BlurWindow.dll differ
diff --git a/nuget/lib/netcoreapp3.1/BlurWindow.dll b/nuget/lib/netcoreapp3.1/BlurWindow.dll
index 5918844..b5dc107 100644
Binary files a/nuget/lib/netcoreapp3.1/BlurWindow.dll and b/nuget/lib/netcoreapp3.1/BlurWindow.dll differ