PostIt

$ gem install postit

Bundler is great at managing your gem dependencies, but if you've ever thought "What I really need is a way to manage my bundler version" -- look no further!

PostIt has a few different modes of operation, all of which attempt to make keeping your team on a consistent bundler version a breeze.

The main way of using PostIt is via the postit command -- you can use it just like the bundle command, and PostIt will handle invoking the correct bundler executable and forwarding along all of your arguments. So to bundle install, you'd just run postit install, etc.

Additionally, if you have require 'bundler/setup' anywhere in your code, you can replace it with require 'postit/setup' and it will activate the correct Bundler version and then require 'bundler/setup'.

If you're building tooling and want to know what version of Bundler PostIt has inferred, you can run postit --bundler-version to have that version printed to STDOUT.

By default, PostIt will read your Bundler version from your Gemfile.lock, meaning you don't have to do anything special to use the same bundler version as the rest of your team -- just postit install and PostIt will automatically infer the correct Bundler version for you.

When invoking postit, you can specify the Bundler version as the first argument, so to run bundle exec with Bundler 1.9.6, for example, you can do postit 1.9.6 exec.

Setting the BUNDLER_VERSION environment variable to the desired Bundler version will work as if you'd passed the version as a command line argument.