Today I ran into the following problem when running bundle install.
Could not verify the SSL certificate for https://rubygems.org/. There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
Reading through the documentation in the link provided I discovered that my certificates had expired. I discovered this by running the following command:
rvm osx-ssl-certs status all
Which pointed out that my certificates had expired.
Certificates for /usr/lib/ssl/cert.pem: Old. Certificates for /Users/Thoughtworks/.rvm/usr/ssl/cert.pem: Old. Certificates for /System/Library/OpenSSL/cert.pem: Old.
To fix this, you simply update your certificates.
sudo rvm osx-ssl-certs update all
Now all my certificates are up to date.
Certificates for /usr/lib/ssl/cert.pem: Up to date. Certificates for /Users/Thoughtworks/.rvm/usr/ssl/cert.pem: Up to date. Certificates for /System/Library/OpenSSL/cert.pem: Up to date.
Success! Hopefully this post will help someone with the same problem. Happy coding.