diff --git a/ReactiveGenerator.Tests/ReactiveGenerator.Tests.csproj b/ReactiveGenerator.Tests/ReactiveGenerator.Tests.csproj
index 5de55ab..608fba7 100644
--- a/ReactiveGenerator.Tests/ReactiveGenerator.Tests.csproj
+++ b/ReactiveGenerator.Tests/ReactiveGenerator.Tests.csproj
@@ -15,6 +15,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.SourceGenerators.Testing" Version="1.1.2"/>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.11.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="ReactiveUI" Version="20.1.63" />
     <PackageReference Include="System.Formats.Asn1" Version="9.0.0" />
     <PackageReference Include="xunit" Version="2.9.2"/>
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2"/>