diff --git a/OpenUtau.Test/OpenUtau.Test.csproj b/OpenUtau.Test/OpenUtau.Test.csproj
index df36dc387..784f3d7b1 100644
--- a/OpenUtau.Test/OpenUtau.Test.csproj
+++ b/OpenUtau.Test/OpenUtau.Test.csproj
@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
-    <TargetFramework>net8.0-windows</TargetFramework>
+    <TargetFramework>net6.0-windows</TargetFramework>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(OS)' != 'Windows_NT' ">
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
   </PropertyGroup>
   <PropertyGroup>
     <SatelliteResourceLanguages>none</SatelliteResourceLanguages>
@@ -12,7 +12,7 @@
 
   <ItemGroup>
     <PackageReference Include="Avalonia.Headless.XUnit" Version="11.2.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="System.Text.Encoding.CodePages" Version="9.0.0" />
     <PackageReference Include="System.Text.Json" Version="9.0.0" />
diff --git a/OpenUtau/OpenUtau.csproj b/OpenUtau/OpenUtau.csproj
index 89afd5484..981897da7 100644
--- a/OpenUtau/OpenUtau.csproj
+++ b/OpenUtau/OpenUtau.csproj
@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
-    <TargetFramework>net8.0-windows</TargetFramework>
+    <TargetFramework>net6.0-windows</TargetFramework>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(OS)' != 'Windows_NT' ">
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
   </PropertyGroup>
   <PropertyGroup>
     <OutputType>WinExe</OutputType>