diff --git a/Refit.Tests/Refit.Tests.csproj b/Refit.Tests/Refit.Tests.csproj
index d368c4de5..ef5811bc3 100644
--- a/Refit.Tests/Refit.Tests.csproj
+++ b/Refit.Tests/Refit.Tests.csproj
@@ -17,7 +17,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
-    <PackageReference Include="System.Reactive" Version="5.0.0" />    
+    <PackageReference Include="System.Reactive" Version="6.0.0" />    
     <PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="2.2.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.0.1" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.SourceGenerators.Testing.XUnit" Version="1.1.2-beta1.23251.2" />