bundler

Bundler manages Ruby application dependencies by enforcing a consistent environment across development, staging, and production.

Bundler tracks and installs the exact gems and versions your Ruby project requires. By parsing your Gemfile, it resolves complex dependency graphs and generates a Gemfile.lock to ensure every team member runs the same code. It integrates seamlessly with Rails, Capistrano, and RSpec to automate environment setup. Whether you are deploying to Heroku or managing a private gem server, Bundler eliminates the 'works on my machine' syndrome by isolating your application's runtime from system-wide library conflicts.

https://bundler.io