Do it, it involves about 3 seconds of downtime per server to run sudo aptitide update and sudo aptitude upgrade . Other package management tools should be equally speedy. If you've rolled your own postgresql binary, get the new sources, re-build, stop services, replace binaries, start services (the old drill...)

The upgrade (on Debian based systems at least) is for libpq5, postgresql-9.1 and postgresql-client-9.1 . You shouldn't need to do anything else unless, for some strange reason, you actually do have a database starting with "-".

Also, I wish you a fine hike!

(probably commented too late, but I hope you had a nice hike, nonetheless)