How to update the bundler version in a Gemfile.lock

  1. Install the latest bundler version:

    gem install bundler
    Fetching bundler-2.3.5.gem
    Successfully installed bundler-2.3.5
    1 gem installed
    
  2. Update the bundler version in Gemfile.lock:

    bundle update --bundler  
    
  3. Confirm it worked:

    $ tail -n2 Gemfile.lock 
    BUNDLED WITH
      2.3.5
    

Notes:

  • Bundler should automatically detect the latest installed version. If it does not, you can specify your preferred version like so:

    bundle _2.1.2_ update --bundler
    
  • Older Ruby and Rails can not use the latest bundler 2 version, so you need to stay on bundler 1.

Emanuel De over 2 years ago
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