diff --git a/src/Dena.CodeAnalysis.Testing/Dena.CodeAnalysis.Testing.csproj b/src/Dena.CodeAnalysis.Testing/Dena.CodeAnalysis.Testing.csproj
index eb51de9..46dcb6d 100644
--- a/src/Dena.CodeAnalysis.Testing/Dena.CodeAnalysis.Testing.csproj
+++ b/src/Dena.CodeAnalysis.Testing/Dena.CodeAnalysis.Testing.csproj
@@ -28,7 +28,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzer.Testing" Version="1.1.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.5.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.9.0" />
     <PackageReference Include="Microsoft.VisualStudio.Composition" Version="16.9.20" />
     <None Include="LICENSE" Pack="true" PackagePath="" />
   </ItemGroup>