diff --git a/src/Splat.DependencyInjection.SourceGenerator.Tests/Splat.DependencyInjection.SourceGenerator.Tests.csproj b/src/Splat.DependencyInjection.SourceGenerator.Tests/Splat.DependencyInjection.SourceGenerator.Tests.csproj
index efe376d..325b0b4 100644
--- a/src/Splat.DependencyInjection.SourceGenerator.Tests/Splat.DependencyInjection.SourceGenerator.Tests.csproj
+++ b/src/Splat.DependencyInjection.SourceGenerator.Tests/Splat.DependencyInjection.SourceGenerator.Tests.csproj
@@ -13,7 +13,7 @@
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     <PackageReference Include="coverlet.msbuild" Version="3.1.2" />
     <PackageReference Include="Verify.SourceGenerators" Version="1.5.0" />
-    <PackageReference Include="ReactiveMarbles.SourceGenerator.TestNuGetHelper" Version="1.2.1" />
+    <PackageReference Include="ReactiveMarbles.SourceGenerator.TestNuGetHelper" Version="1.2.21" />
     <PackageReference Include="Verify.Xunit" Version="17.1.6" />
     <PackageRefernece Include="Microsoft.CodeAnalysis.CSharp" Version="3.10.0" PrivateAssets="all" />
   </ItemGroup>