In this article, I’ll highlight the latest .**NET 9 SignalR updates** for ASP.NET Core 9.0.

### SignalR Hub Accepts Base Classes
SignalR `Hub` class can now get a base class of a polymorphic class. As you see in the example below, I can send `Animal` to `Process` method. Before .NET 9, we could only pass the derived classes: `Cat` and `Dog`.