diff --git a/src/nunit.analyzers.tests/nunit.analyzers.tests.csproj b/src/nunit.analyzers.tests/nunit.analyzers.tests.csproj
index b8e74507..f7f4aaae 100644
--- a/src/nunit.analyzers.tests/nunit.analyzers.tests.csproj
+++ b/src/nunit.analyzers.tests/nunit.analyzers.tests.csproj
@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.1.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup>
@@ -18,7 +18,7 @@
     <PackageReference Include="Gu.Roslyn.Asserts" Version="4.3.0" />
     <PackageReference Include="Gu.Roslyn.Asserts.Analyzers" Version="4.0.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="5.2.0" />
-    <PackageReference Include="System.Collections.Immutable" Version="6.0.0" />
+    <PackageReference Include="System.Collections.Immutable" Version="9.0.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(NUnitVersion)' == '4'">