In case someone has similar problems:
By running:
sudo rvm osx-ssl-certs status all
you will probably see that your certificates are out of date. He will say something like this:
Certificates for /System/Library/OpenSSL/cert.pem: Old. .
You need to update, so run this:
sudo rvm osx-ssl-certs update all .
Re-enabling the status command should give something like:
Certificates for /System/Library/OpenSSL/cert.pem: Up to date.
Happy days, the problem is fixed.
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