rubygems failure during bundle install

gistfile1.txt

Bundler::Fetcher::CertificateFailureError: 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'.
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/fetcher.rb:209:in `rescue in fetch'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/fetcher.rb:199:in `fetch'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/fetcher.rb:222:in `fetch'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/fetcher.rb:92:in `fetch_spec'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/remote_specification.rb:46:in `_remote_specification'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/remote_specification.rb:51:in `method_missing'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/spec_set.rb:133:in `tsort_each_child'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:203:in `each_strongly_connected_component_from'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/spec_set.rb:129:in `block in tsort_each_node'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/spec_set.rb:129:in `each'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/spec_set.rb:129:in `tsort_each_node'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:135:in `tsort'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/spec_set.rb:112:in `sorted'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/installer.rb:90:in `run'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/installer.rb:14:in `install'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/cli.rb:247:in `install'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/vendor/thor/task.rb:27:in `run'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/vendor/thor/invocation.rb:120:in `invoke_task'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/vendor/thor.rb:344:in `dispatch'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/vendor/thor/base.rb:434:in `start'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/bin/bundle:20:in `block in <top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/friendly_errors.rb:3:in `with_friendly_errors'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/bin/bundle:20:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/bin/bundle:23:in `load'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/bin/bundle:23:in `<main>'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/bin/ruby_executable_hooks:15:in `eval'
 /home/ubuntu/.rvm/gems/ruby-2.0.0-p247@global/bin/ruby_executable_hooks:15:in `<main>'