An upward grade or slope.

An improved component or replacement item, usually applied to technology

An improvement

(transitive) To improve, usually applied to technology, generally by complete replacement of one or more components

(transitive) To replace with something better.

(transitive) To improve the equipment or furnishings of or services rendered to

(intransitive) To improve in condition or status.

(intransitive, computing) To replace a program with a later version of itself, a version having a higher version number or marketed under a more recent product name. (Can we add an example for this sense?)

Up a slope or grade.