You upgraded to a shiny new M1 Mac (MacBook, MacBook Pro or Mac Mini) but now brew is broken on your new ARM machine. You can easily fix this:

Depending if you use zsh or bash you need to put the following in either ~/.zshrc or ~/.bashrc :

alias brew='arch -x86_64 brew'

If you haven’t installed Rosetta 2 on your machine yet, you will automatically get an installation prompt the first time you run brew.

This will emulate brew (for now) using Rosetta 2 until brew officially supports ARM on Mac.

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You just upgraded your brew packages and composer updated itself to version 2.x but you still need version 1.x? This is how you can downgrade (& upgrade again):

Show available versions of composer:

brew log composer

For me the latest 1.x version to date is: composer 1.10.15

Let’s downgrade

composer self-update 1.10.15

To switch back to the 2.x version use

composer self-update --rollback

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Sascha Eggenberger

Sascha Eggenberger

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Sascha Eggenberger. Senior Product Designer @GitLab. Drupal Core Maintainer. Drupal Design System, Claro, Gin. #OpenSource https://sascha.is/