upgrade (n.) Look up upgrade at Dictionary.com
also up-grade, 1873, "upward slope," from up (adj.) + grade (n.). The meaning "upgraded version" is recorded from 1980.
upgrade (v.) Look up upgrade at Dictionary.com
"increase to a higher grade or rank," 1920 (transitive); 1950 (intransitive), from up (adv.) + grade (v.). Related: Upgraded; upgrading.