upgrade
n. countablen. a change to a better, newer, or more powerful version of something. You often use this for software, computers, or getting a better seat on a plane.
n. an improvement to a newer or higher standard of quality, efficiency, or status. Often refers to hardware or software enhancements or the act of moving to a superior class of service.
I need a memory upgrade for my laptop.
The airline offered her a free upgrade to business class because the flight was overbooked.
While the software upgrade promised significant performance gains, the legacy hardware struggled to handle the increased processing demands of the new operating system.
From up- + grade.
Commonly takes the preposition 'to' when describing the target of the improvement.
an upgrade of my phonean upgrade to my phoneWhen referring to the object being improved, 'to' is the standard preposition used with this noun.