Noob question

in a production machine i am running asterisk 10 and i need to apply an update. what is the safest way to do it?
apart from a clean install of the new asterisk, by removing the old version, is there another way to do it?

On this chapter could be the answer to your question

http://www.asteriskdocs.org/en/3rd_Edition/asterisk-book-html-chunk/Installing_id292827.html

Thanks a lot. this thread could close now.