How to say "upgrade" in Japanese

• アップグレード
  noun, suru verb, transitive verbA direct loanword covering the general sense of upgrade: making something better or moving it to a newer version, as with software or hardware.
  現在げんざいのバージョンは、アップグレード版ばんで置き換おきかえます。↗

  We will replace the current version with the upgrade.
• グレードアップ
  noun, suru verb, intransitive verb, transitive verbSuits upgrade in the sense of raising something to a higher grade or level, improving its quality. It can also mean update.
• アプグレ
  noun, suru verb, transitive verbA colloquial abbreviation meaning upgrade; it fits casual conversation about upgrading something, but not formal writing.
• バージョンアップ
  noun, suru verb, transitive verbConfined to the software sense: updating a program or upgrading it to a new version. Use it when the point is moving from one version to a newer one.
  Ｍａｃ ＯＳ Ｘといっても、Ｍａｃ ＯＳのコードをバージョンアップした訳わけではない。↗

  Although it's "Mac OS X", that doesn't mean that the Mac OS code itself has been upgraded to a new version.
• 上り勾配のぼりこうばい
  nounCovers only the literal sense: an uphill grade, an upward slope on a road or railway. For upgrading software or anything else, this is not the word you want.

Choose 「アップグレード」 for upgrading in general, 「バージョンアップ」 when software moves to a new version, 「グレードアップ」 for raising quality or level, 「アプグレ」 in casual speech, and 「上り勾配」 only for a literal uphill slope.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• アップグレードupgrade
• グレードアップupgrade
• アプグレupgrade
• バージョンアップ(software) update
• 上り勾配のぼりこうばいuphill grade