diff --git a/Shadowsocks.Tests/Shadowsocks.Tests.csproj b/Shadowsocks.Tests/Shadowsocks.Tests.csproj
index 4b55542b..f5946dc3 100644
--- a/Shadowsocks.Tests/Shadowsocks.Tests.csproj
+++ b/Shadowsocks.Tests/Shadowsocks.Tests.csproj
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/Shadowsocks.WPF.Tests/Shadowsocks.WPF.Tests.csproj b/Shadowsocks.WPF.Tests/Shadowsocks.WPF.Tests.csproj
index 9e107893..06ac6d88 100644
--- a/Shadowsocks.WPF.Tests/Shadowsocks.WPF.Tests.csproj
+++ b/Shadowsocks.WPF.Tests/Shadowsocks.WPF.Tests.csproj
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>