upgrading
up-grad-ing
verb
The act of improving something by replacing it with a newer or better version.
"They are upgrading the railway line."
Thesaurus
Synonyms: upgrade, kick upstairs, promote, raise, advance, elevate, rise, ascent, acclivity, climb, rising slope
Antonyms: break, bump, declension, declination, decline, declivity, demote, descent, downgrade, downslope, fall, kick downstairs