awscliをbrewコマンドを使ってupgradeする
FormulaUnavailableError: No available formula with the name
とエラーが表示されたときは、
brew tap <package name>
と入力するとアップグレード可能
$ brew upgrade awscli
==> Installing python@2
Error: An exception occurred within a child process:
FormulaUnavailableError: No available formula with the name "/usr/local/opt/python@2/.brew/python@2.rb"
$ brew tap python@2
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
Updated 1 formula.
$ brew upgrade awscli
Warning: awscli 2.0.40 already installed