diff --git a/.github/workflows/ReleaseNotes.md b/.github/workflows/ReleaseNotes.md
index f1aa2d52..d0afced5 100644
--- a/.github/workflows/ReleaseNotes.md
+++ b/.github/workflows/ReleaseNotes.md
@@ -1,2 +1 @@
-* [Client] Fixed wrong TLS options handling (#1830).
-* [Client] Fixed NullReferenceExeption when performing a Ping when the client is not connected (#1831).
+* [Server] Fixed not working _UpdateRetainedMessageAsync_ public api (#1858, thanks to @kimdiego2098)
diff --git a/Source/MQTTnet/Server/MqttServer.cs b/Source/MQTTnet/Server/MqttServer.cs
index ff6c806e..a28f8256 100644
--- a/Source/MQTTnet/Server/MqttServer.cs
+++ b/Source/MQTTnet/Server/MqttServer.cs
@@ -362,7 +362,7 @@ namespace MQTTnet.Server
             ThrowIfDisposed();
             ThrowIfNotStarted();
 
-            return _retainedMessagesManager?.UpdateMessage(null, retainedMessage);
+            return _retainedMessagesManager?.UpdateMessage(string.Empty, retainedMessage);
         }
 
         protected override void Dispose(bool disposing)
@@ -405,4 +405,4 @@ namespace MQTTnet.Server
             }
         }
     }
-}
\ No newline at end of file
+}