NServiceBus 8.1.2, 8.0.4, and 7.8.3 – Patch releases available

Hi everyone,

We’ve just released NServiceBus 8.1.2, 8.0.4, and 7.8.3.

Fixed bugs

  • #6820 AssemblyScanning exclusion list slows down the endpoint startup


  • #6813 Startup diagnostic serialization fails when diagnostic entries include System.Type properties

How to know if you are affected

You are affected if you are using the assembly scanner together with an exclusion list, for example:

var scanner = endpointConfiguration.AssemblyScanner();

scanner.ExcludeAssemblies("MyAssembly1.dll", ...,"OtherAssembly.dll");


When excluding a set of assemblies, the endpoint takes an excessively long amount of time to start.

When to upgrade

You should upgrade during the next maintenance window if you are affected.

Where to get it

You can install the new versions of NServiceBus from NuGet.

With thanks,
The team in Particular

Please read our release policy for more details.

With the release of this version we have introduced a regression. We are working on a fix. More details available in

The new versions addressing the regression are out