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Bundler: The best way to manage a Ruby application's gems
Bundler provides a consistent environment for Ruby projects by tracking and installing the exact gems and versions that are needed.
Bundler is an exit from dependency hell, and ensures that the gems
you need are present in development, staging, and production.
Starting work on a project is as simple as bundle install.
The latest news
Jul 17, 2025 Bundler v2.7: last release before Bundler 4
Getting Started
This guide assumes that you have Ruby installed. If you do not have Ruby installed, do that first and then check back here! Any modern distribution of Ruby comes with Bundler preinstalled by default.
Getting started with bundler is easy! Specify your dependencies in a Gemfile in your project's root:
source 'https://rubygems.org'
gem 'nokogiri'
gem 'rack', '~> 2.2.4'
gem 'rspec'Install all of the required gems from your specified sources:
$ bundle install
$ git add Gemfile Gemfile.lockGet involved
Bundler has a lot of contributors and users, and we would love to have your help!
If you have questions, join the Bundler Slack
and we'll try to answer them. If you're interested in contributing (no programming skills needed), start with
the contributing guide.
While participating in the Bundler project, please keep the code of conduct
in mind, and be inclusive and friendly towards everyone.
If you think you've found a security issue, please report it via HackerOne.