Upgrade

an upward slope or grade (as in a road)

software that provides better performance than an earlier version did

a reservation that is improved

the property possessed by a slope or surface that rises

hardware that provides better performance than an earlier version did

the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)

rate higher

to improve what was old or outdated

give a promotion to or assign to a higher position

get better travel conditions

give better travel conditions to