diff --git a/Shadowsocks.Tests/Shadowsocks.Tests.csproj b/Shadowsocks.Tests/Shadowsocks.Tests.csproj
index ebdc48e3..4b55542b 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="16.8.3" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
     <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 591d94e7..9e107893 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="16.8.3" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
     <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/test/ShadowsocksTest.csproj b/test/ShadowsocksTest.csproj
index 69895da1..6dd69a8b 100644
--- a/test/ShadowsocksTest.csproj
+++ b/test/ShadowsocksTest.csproj
@@ -14,7 +14,7 @@
 
   <ItemGroup>
     <PackageReference Include="GlobalHotKeyCore" Version="1.2.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.1.0" />
     <PackageReference Include="MSTest.TestFramework" Version="2.1.0" />
     <PackageReference Include="coverlet.collector" Version="3.0.3">