Mac上的Brew老旧了

输入

brew --version

跳出：

/usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:32:in `block in from_symbol’: unknown or unsupported macOS version: :dunno (MacOSVersionError)

解决方案：

brew update-reset
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
brew doctor
brew cleanup

再次查看

brew --version

OK，万事大吉了