转自：https://blog.csdn.net/gorwayne/article/details/107359912
第一步，替换brew.git
cd "$(brew --repo)" git remote set-url origin https://mirrors.ustc.edu.cn/brew.git
第二步：替换homebrew-core.git
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core" git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
第三步：替换homebrew-cask默认源
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-cask" git remote set-url origin git://mirrors.ustc.edu.cn/homebrew-cask.git
第四步：替换homebrew-bottle默认源
echo ‘export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles‘ >> ~/.bashrc
source ~/.bashrc
最后使用
brew update --verbose
原文：https://www.cnblogs.com/f-society/p/13798493.html