Could not verify the SSL certificate for https://rubygems.org/

Running gem update --system worked for me

The solution for me on OS X 10.9.5 was to sudo rvm osx-ssl-certs update all.

Source: http://jacopretorius.net/2013/10/could-not-verify-the-ssl-certificate-for-rubygems.html

I had this problem on Mac OS X Yosemite with ruby 2.3.1. I fixed the problem by downloading http://curl.haxx.se/ca/cacert.pem to /usr/local/etc/openssl/

and adding this line export SSL_CERT_FILE=/usr/local/etc/openssl/cacert.pem to .bash_profile

Credit to Can't run Ruby 2.2.3 with RVM on OSX but it was hard to google the right answer, so added to this page.