Please note that these warnings are just used to help the Homebrew maintainers When done, you can verify that some “probably” dependencies needs install/update with run brew doctor until it only show 1 warning, which is outdated operating system: If everything is correct, you can update and upgrade Homebrew with commands: After it extracted, you need to accept its license by run command: After downloaded, you can extract to /Application that will be about 10GB contents, if you’re using old mac hardware, it may take a while. If you’re still using older version, you can first remove the Application/Xcode directory and download manually (yes, manually) as you cannot update via App Store from the following URI: Read above warning carefully before continue, as you will responsible yourself if experiencing issues.įirst, if you are still want to try it, what you need to do is verify that you have latest Xcode 9.2 that support macOS Sierra: You are responsible for resolving any issues youĮxperience while you are running this old version. Please create pull requests instead of asking for help on Homebrew's GitHub,ĭiscourse, Twitter or IRC. You will encounter build failures with some formulae. We (and Apple) do not provide support for this old version. You can still using Homebrew, while you will get the following warning: So, you’re still using macOS Sierra because of old mac hardware or whatever reason.