How to upgrade hawtio separately?

Hi everyone!

Is there a simple way to upgrade hawtio to for example version 1.2.2?

If I replace the entire webapps/howtio/ with the new version of hawtio, I
get many InstanceAlreadyExistsException.

I am using ActiveMQ 5.9.0. and hawtio within Web container.

Thanks in advance.

Nader