source 'https://gems.contribsys.com/' do
  gem 'sidekiq-pro'
end

::Bundler.locked_gems.specs.find { |s| s.name == "sidekiq-pro" }.homepage
#=> "http://sidekiq.org"
# [...]
::Bundler.locked_gems.specs.find { |s| s.name == "sidekiq-pro" }.metadata
#=> {"allowed_push_host"=>"https://gems.contribsys.com", "changelog_uri"=>"https://github.com/mperham/sidekiq/blob/master/Pro-Changes.md", "documentation_uri"=>"https://github.com/mperham/sidekiq/wiki", "wiki_uri"=>"https://github.com/mperham/sidekiq/wiki"}