Dealing With ‘you Must Use Bundler 2 Or Greater’ In Ruby

Dealing with “you Must Use Bundler 2 or Greater” Error in Ruby


When you encounter the “you must use Bundler 2 or greater” error while running Ruby code, it likely indicates that your version of Bundler is outdated. To resolve this issue, you can update Bundler by following these steps:


1. Open your terminal or command line interface:


  • For macOS/Linux: Open a Terminal window
  • For Windows: Open a Command Prompt window

2. Run the following command:

gem install bundler  # will install Bundler 2+ globally

3. Update your Gemfile:

  • Open the Gemfile that is problematic or used in the project
  • Change the specified version of Bundler to a global specification. This means replacing the line:
    gem 'bundler'


    gem 'bundler', '~> 2.2' # it will accept all 2.x versions of `bundler` unless otherwise specified & secured

4. Run bundle install again:

  • Now rerun your bundle install command, which should work without the “must use Bundler 2 or greater” error.

Additional Tips:

  • If you encounter permission issues while updating Bundler globally, try running the gem install command with sudo.
  • If you prefer to install Bundler locally for the current project, run bundle update bundler within the project directory instead.
  • To confirm whether Bundler is updated successfully, you can run gem list bundler and check the installed version.Dealing With ‘You Must Use Bundler 2 Or Greater’ In Ruby

Executive Summary

This article provides a comprehensive guide to resolving the “You must use Bundler 2 or greater” error in Ruby. It explores the causes, solutions, and best practices associated with this issue, empowering developers to effectively manage their Ruby environments and dependencies.


Ruby’s dependency management system, Bundler, plays a crucial role in ensuring the reliability and consistency of Ruby applications. An outdated version of Bundler can lead to various issues, including the “You must use Bundler 2 or greater” error. This article delves into the intricacies of this error and provides proven solutions to overcome it.

Causes of the Error

  • Using an outdated version of Bundler (less than 2.0)
  • Attempting to install gems that require Bundler 2 or later
  • Inconsistent versions of Bundler across different Ruby environments

Solutions to the Error

1. Upgrade Bundler

  • Run gem install bundler or bundle update to upgrade Bundler to the latest version.
  • Verify the installed version using bundle --version.

2. Install Compatible Gems

  • Ensure that the gems being installed are compatible with Bundler 2 or later.
  • Consult the gem’s documentation or the RubyGems website for compatibility information.

3. Enforce Bundler Version

  • Add gem 'bundler', '~>2.0' to the Gemfile to enforce the use of Bundler 2 or later.
  • Run bundle update to install the specified version of Bundler.

4. Use Local Bundler

  • Install a local version of Bundler using bundle install --local.
  • This ensures that the specific version of Bundler is used for the current project, independent of the global system-wide version.

5. Downgrade Gems

  • In rare cases, downgrading gems that require Bundler 2 may be necessary.
  • Carefully assess the consequences before downgrading gems and consider alternative solutions.

Best Practices for Dependency Management

  • Stay Up-to-Date: Regularly update Bundler and gems to ensure compatibility and address potential issues.
  • Use a Gemfile: Manage dependencies through a single Gemfile to maintain a consistent and manageable environment.
  • Avoid Global Installations: Install gems in the local project directory using Bundler to prevent conflicts with system-wide installations.
  • Use Bundler Groups: Utilize Bundler groups to manage different groups of dependencies for various environments or purposes.
  • Understand Dependency Resolution: Familiarize yourself with Bundler’s dependency resolution process to avoid potential conflicts and errors.


The “You must use Bundler 2 or greater” error is a common issue that can be effectively resolved by understanding the causes and applying the solutions outlined in this article. By adopting best practices for dependency management, developers can confidently manage Ruby environments and ensure the reliability and consistency of their applications.

Keyword Phrase Tags

  • “You must use Bundler 2 or greater” error in Ruby
  • Upgrade Bundler to resolve the error
  • Install compatible Ruby gems
  • Enforce a specific Bundler version
  • Best practices for Ruby dependency management
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Comments 10
  1. It appears that the author has not provided enough context for the error message. Without additional information, it is difficult to determine the root cause of the issue.

  2. I have encountered this error before, and it is typically caused by an outdated version of Bundler. Upgrading Bundler to version 2 or greater should resolve the issue.

  3. This error message can also occur if there is a conflict between the versions of Bundler specified in the Gemfile and the versions installed on the system.

  4. I’m not sure I agree with the author’s conclusion that upgrading Bundler is the only solution to this error. There may be other underlying issues that need to be addressed.

  5. Well, well, well. It seems that the author has fallen victim to the dreaded ‘you must use Bundler 2 or greater’ error. How ironic!

  6. Oh, the joys of Ruby development! Just when you think you have everything figured out, you get hit with this cryptic error message. Thanks for the ‘helpful’ advice, Bundler.

  7. I can’t help but imagine Bundler as a sassy librarian, shushing developers who dare to use outdated versions. ‘Silence! You must use Bundler 2 or greater, or face my wrath!’

  8. Wow, this is so helpful! I’m a Ruby newbie, and I was really struggling with this error. Thanks so much for explaining it in such a clear and concise way!

  9. Ah, the dreaded ‘you must use Bundler 2 or greater’ error. It has plagued Ruby developers for far too long. I wish there was an easier way to fix it.

  10. Bundler is a powerful tool for managing Ruby dependencies. Upgrading to version 2 or greater ensures that you have the latest features and security fixes. It’s worth the effort to keep your Bundler up to date.

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