diff --git a/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj b/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj
index bfc4940a5..7ffa73ad4 100644
--- a/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj
+++ b/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj
@@ -12,11 +12,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.11.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.8.0" />
   </ItemGroup>
 
   <Target Name="SetBuildVer" AfterTargets="GetBuildVersion" BeforeTargets="SetCloudBuildVersionVars;SetCloudBuildNumberWithVersion">
-    <PropertyGroup>      
+    <PropertyGroup>
       <Version>$(BuildVersion)</Version>
       <AssemblyVersion>$(BuildVersionSimple)</AssemblyVersion>
     </PropertyGroup>
diff --git a/InterfaceStubGenerator.Roslyn40/InterfaceStubGenerator.Roslyn40.csproj b/InterfaceStubGenerator.Roslyn40/InterfaceStubGenerator.Roslyn40.csproj
index 7ee02683a..ff5bcf9d7 100644
--- a/InterfaceStubGenerator.Roslyn40/InterfaceStubGenerator.Roslyn40.csproj
+++ b/InterfaceStubGenerator.Roslyn40/InterfaceStubGenerator.Roslyn40.csproj
@@ -13,7 +13,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" PrivateAssets="all" />
   </ItemGroup>
 
   <Target Name="SetBuildVer" AfterTargets="GetBuildVersion" BeforeTargets="SetCloudBuildVersionVars;SetCloudBuildNumberWithVersion">
diff --git a/Refit.sln b/Refit.sln
index fdeb099bb..26aff3fed 100644
--- a/Refit.sln
+++ b/Refit.sln
@@ -36,6 +36,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Refit.Benchmarks", "Refit.B
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Refit.GeneratorTests", "Refit.GeneratorTests\Refit.GeneratorTests.csproj", "{CE7894EA-D411-494A-BA8B-1C231D45025D}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sandbox3", "Sandbox3\Sandbox3.csproj", "{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -192,6 +194,22 @@ Global
 		{CE7894EA-D411-494A-BA8B-1C231D45025D}.Release|x64.Build.0 = Release|Any CPU
 		{CE7894EA-D411-494A-BA8B-1C231D45025D}.Release|x86.ActiveCfg = Release|Any CPU
 		{CE7894EA-D411-494A-BA8B-1C231D45025D}.Release|x86.Build.0 = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|ARM.Build.0 = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|x64.Build.0 = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Debug|x86.Build.0 = Debug|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|ARM.ActiveCfg = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|ARM.Build.0 = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|x64.ActiveCfg = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|x64.Build.0 = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|x86.ActiveCfg = Release|Any CPU
+		{C974C7E5-71DF-4404-B5E2-58FB81A6E65A}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/Sandbox3/Program.cs b/Sandbox3/Program.cs
new file mode 100644
index 000000000..75c898183
--- /dev/null
+++ b/Sandbox3/Program.cs
@@ -0,0 +1,14 @@
+// See https://aka.ms/new-console-template for more information
+
+using Refit;
+
+var gitHubApi = RestService.For<IGitHubApi>("https://api.github.com");
+Console.WriteLine("Success?");
+
+public interface IGitHubApi
+{
+    [Get("/users/{user}")]
+    Task<User> GetUser(string user);
+}
+
+public record User();
diff --git a/Sandbox3/Sandbox3.csproj b/Sandbox3/Sandbox3.csproj
new file mode 100644
index 000000000..69a0f0394
--- /dev/null
+++ b/Sandbox3/Sandbox3.csproj
@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\InterfaceStubGenerator.Roslyn40\InterfaceStubGenerator.Roslyn40.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="true"/>
+      <ProjectReference Include="..\Refit\Refit.csproj" />
+    </ItemGroup>
+
+</Project>