diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 00339fad9..c9cd91e9e 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -851,6 +851,10 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
     {:ok, data}
   end
 
+  def prepare_outgoing(%{"type" => "Update", "object" => %{}} = data) do
+    raise "Requested to serve an Update for non-updateable object type:  #{inspect(data)}"
+  end
+
   def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
     object =
       object_id