diff --git a/tests/Tests/Tests.csproj b/tests/Tests/Tests.csproj
index ae5689b85d..7be36f1c05 100644
--- a/tests/Tests/Tests.csproj
+++ b/tests/Tests/Tests.csproj
@@ -17,7 +17,7 @@
     <ProjectReference Include="$(SolutionRoot)\tests\Tests.Core\Tests.Core.csproj" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.2" />
     <PackageReference Include="FSharp.Core" Version="7.0.300" />
-    <PackageReference Include="System.Reactive" Version="5.0.0" />
+    <PackageReference Include="System.Reactive" Version="6.0.0" />
     <PackageReference Include="SemanticVersioning" Version="2.0.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
     <PackageReference Include="Ben.Demystifier" Version="0.4.1" />