The "https://packagist.org/packages.json" file could not be downloaded: failed to open stream: Operation timed out Retrying with degraded mode, check https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode for more info
For some reason, ipv6 isn’t great for packagist.
Find your network adapter and turn off ipv6:
~$ networksetup -listallnetworkservices An asterisk (*) denotes that a network service is disabled. Wi-Fi Bluetooth PAN Thunderbolt Bridge ~$ networksetup -setv6off Wi-Fi