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Editorial Team
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Asked: 2026-06-13T20:20:00+00:00

I maintain a gem with dependencies that are stored in a Gemfile , for

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I maintain a gem with dependencies that are stored in a Gemfile, for example:

gem 'foo', '~> 1.5'
gem 'bar', '~> 2.0.5'

Thanks to pessimistic version constraints, bundler will by default install the latest 1.x version of foo, but can compromise on a lower version if my gem is used in conjunction with another that requires (for example) foo =1.6.2

Question: Is there a simple way to get bundler to install all of the minimum versions of my dependencies (in this case, foo =1.5.0 and bar =2.0.5) so that I can test whether, after I write some new functionality, my gem will still work in combination with other environments that use those lower versions?

Or, is the only way for me to manually reinstall all of the minimum versions and then run my tests?

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  1. Editorial Team

    Because we decided to use Rubygems’ Requirement class, there isn’t a way to specify the lowest version. I vaguely recall an automated testing tool to help you iterate over dependency versions that you want to test against, but it’s extremely hard to automate because there are an exponential number of possible version combinations. I suggest creating a second Gemfile with the oldest versions you want to test against, and using BUNDLE_GEMFILE to run against that Gemfile in an additional CI build.

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