Peer certificate cannot be authenticated with given CA certificates

[ben.turner]

If so, you might try the solution in this thread:

Expired SSL certificate

Thanks for the info @EcomEric @sandersweb – From my research into this, I think the issue is that we need to update Mac’s SSL certs (as you mention). It looks like Loca’s PHP under Mac is using the cURL extension. Because of this, the outdated cert bundle is located at /etc/ssl/cert.pem This StackOverflow answer from a couple of days ago seems to have fixed things for me on my Mac Big Sur machine: ssl certificate - cert in /etc/ssl/cert.pem expired today (MacOS Mojave) - Stack Overflow To r…

Note that there was another couple of follow on things that some users needed to do further down the thread, though I’m not 100% sure that you need to do that to just get Composer working.