diff --git a/lib/broadside/ecs/ecs_manager.rb b/lib/broadside/ecs/ecs_manager.rb
index c046696..5dec0d6 100644
--- a/lib/broadside/ecs/ecs_manager.rb
+++ b/lib/broadside/ecs/ecs_manager.rb
@@ -35,7 +35,7 @@ def deregister_last_n_tasks_definitions(name, count)
 
       def get_latest_task_definition(name)
         return nil unless (arn = get_latest_task_definition_arn(name))
-        ecs.describe_task_definition(task_definition: arn).task_definition.to_h
+        ecs.describe_task_definition(task_definition: arn).task_definition.to_h.reject {|k, _v| k == :registered_at || k == :registered_by }
       end
 
       def get_latest_task_definition_arn(name)