diff --git a/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj b/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj
index 6e9ca887a..bfc4940a5 100644
--- a/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj
+++ b/InterfaceStubGenerator.Roslyn38/InterfaceStubGenerator.Roslyn38.csproj
@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.8.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.11.0" />
   </ItemGroup>
 
   <Target Name="SetBuildVer" AfterTargets="GetBuildVersion" BeforeTargets="SetCloudBuildVersionVars;SetCloudBuildNumberWithVersion">
diff --git a/InterfaceStubGenerator.Roslyn40/InterfaceStubGenerator.Roslyn40.csproj b/InterfaceStubGenerator.Roslyn40/InterfaceStubGenerator.Roslyn40.csproj
index ff5bcf9d7..7ee02683a 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="4.0.1" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" PrivateAssets="all" />
   </ItemGroup>
 
   <Target Name="SetBuildVer" AfterTargets="GetBuildVersion" BeforeTargets="SetCloudBuildVersionVars;SetCloudBuildNumberWithVersion">
diff --git a/Refit.GeneratorTests/Refit.GeneratorTests.csproj b/Refit.GeneratorTests/Refit.GeneratorTests.csproj
index 76d4f1e27..35762849e 100644
--- a/Refit.GeneratorTests/Refit.GeneratorTests.csproj
+++ b/Refit.GeneratorTests/Refit.GeneratorTests.csproj
@@ -17,13 +17,13 @@
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.0"/>
         <PackageReference Include="xunit" Version="2.9.0"/>
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2"/>
-        <PackageReference Include="System.Collections.Immutable" Version="9.0.0-preview.5.24306.7" />
+        <PackageReference Include="System.Collections.Immutable" Version="9.0.0-preview.7.24405.7" />
         <PackageReference Include="Verify.DiffPlex" Version="3.1.0" />
         <PackageReference Include="Verify.SourceGenerators" Version="2.3.0" />
         <PackageReference Include="Verify.Xunit" Version="26.2.0" />
         <PackageReference Include="System.Reactive" Version="6.0.1" />
         <PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="2.2.0" />
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.9.2" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.11.0" />
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp.SourceGenerators.Testing" Version="1.1.2" />
         <ProjectReference Include="..\Refit.Newtonsoft.Json\Refit.Newtonsoft.Json.csproj" />
         <ProjectReference Include="..\Refit.Xml\Refit.Xml.csproj" />
diff --git a/Refit.Tests/Refit.Tests.csproj b/Refit.Tests/Refit.Tests.csproj
index be87476f6..65b042b01 100644
--- a/Refit.Tests/Refit.Tests.csproj
+++ b/Refit.Tests/Refit.Tests.csproj
@@ -25,7 +25,7 @@
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
     <PackageReference Include="System.Reactive" Version="6.0.1" />
     <PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="2.2.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.9.2" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.11.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.SourceGenerators.Testing" Version="1.1.2" />
     <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
     <ProjectReference Include="..\Refit.HttpClientFactory\Refit.HttpClientFactory.csproj" />