我Mac的ruby环境是2.6.2,我记得之前的cocoapods都装到1.10.x了，不知道什么原因，卸载后再安装就只能到1.5.3了，私活折腾不起来。最后查阅cocoapods官网，有个ruby3.2.2这么句提示，就把ruby环境升级了下，完了再去装cocoapods，就是1.12.1了。希望对大家有帮助。
升级ruby参考文章：

The best way to use ruby on mac is to use ruby version manager. I use rbenv. It allows you easly to switch between different ruby versions and doesn't cause conflicts.

To install it run brew install rbenv ruby-build

then echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

and finally source ~/.bash_profile

now install any ruby for example 3.0.0 by typing rbenv install 3.0.0 and set it globally rbenv global 3.0.0

edit: This may not work if you're using different shell. Check what shell is your default by running echo $SHELL

If your default shell is zsh, then instead of your second and third steps run:

echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.zshrc

echo 'eval "$(rbenv init -)"' >> ~/.zshrc

source ~/.zshrc