diff --git a/.github/workflows/dotnet-format.yml b/.github/workflows/dotnet-format.yml
index f23f993dbf19..49cdd7a2827b 100644
--- a/.github/workflows/dotnet-format.yml
+++ b/.github/workflows/dotnet-format.yml
@@ -26,6 +26,7 @@ jobs:
       matrix:
         include:
           - { dotnet: "8.0", configuration: Release, os: ubuntu-latest }
+          - { dotnet: "9.0", configuration: Release, os: ubuntu-latest }
 
     runs-on: ${{ matrix.os }}
     env:
diff --git a/dotnet/src/Experimental/Process.Abstractions/IKernelExternalProcessMessageChannel.cs b/dotnet/src/Experimental/Process.Abstractions/IKernelExternalProcessMessageChannel.cs
index fa0aea0727e3..edafb8ae3e91 100644
--- a/dotnet/src/Experimental/Process.Abstractions/IKernelExternalProcessMessageChannel.cs
+++ b/dotnet/src/Experimental/Process.Abstractions/IKernelExternalProcessMessageChannel.cs
@@ -28,5 +28,5 @@ public interface IExternalKernelProcessMessageChannel
     /// <param name="externalTopicEvent">name of the topic to be used externally as the event name</param>
     /// <param name="eventData">data to be transmitted externally</param>
     /// <returns></returns>
-    public abstract Task EmitExternalEventAsync(string externalTopicEvent, KernelProcessProxyMessage eventData);
+    abstract Task EmitExternalEventAsync(string externalTopicEvent, KernelProcessProxyMessage eventData);
 }