Block a specific gem version in your Gemfile in Bundler

If you ever want to exclude or block a specific version of a gem in Bundler, you can.

The syntax for excluding a particular gem version in bundler is super simple:

This is most useful if you have a gem version that is broken and you want to exclude it, but don’t want to exclude all upgrades. A typical Gemfile using this might look like:

This will allow any versions of gemname in the 1.x.x series, except for 1.0.1.

When the maintainers of gemname incorporate a fix (hopefully based on your pull request and release gemname 1.0.2, you can quickly update your Gemfile.lock by running bundle update gemname. It will automatically stop the upgrade until there is a version after 1.0.1.

Here’s the code in Bundler that defines the DSL in lib/bundler/version_ranges.rb in version 1.16:

{: data-start=”46″}

This feature is undocumented in bundler, so thought it worth highlighting briefly.

Ready to start your career at Simply Business?

Want to know more about what it’s like to work in tech at Simply Business? Read about our approach to tech, then check out our current vacancies.

Lukas Oberhuber

This block is configured using JavaScript. A preview is not available in the editor.