To install gems Bundler needs to be able to talk to https://api.rubygems.org.

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If you are behind a proxy you can use the https_proxy environment variable:

https_proxy=http://myproxy:123 bundle install

Note that if there is no https_proxy env variable, Bundler will also look for a http_proxy env variable.

With Capistrano

Ideally the server you're deploying on exports an https_proxy variable for all shells.

If you don't have control over the server setup, you can also add this to your Capistrano config:

set :bundle_env_variables, { 'https_proxy' => 'http://myproxy:123' }