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Asked: 2026-05-22T01:41:51+00:00

I have a rails application that I deploy on Heroku. I’m using several different

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I have a rails application that I deploy on Heroku. I’m using several different machines, and I noticed that when I add new dependencies (so that Gemfile.lock is rebuilt) and do bundle install on my Windows computer at home, push to Heroku fails with the following error:

   Unresolved dependencies detected; Installing...
   Windows Gemfile.lock detected, ignoring it.
   You have modified your Gemfile in development but did not check
   the resulting snapshot (Gemfile.lock) into version control
   ...

Gemfile.lock IS under version control, but Heroku appearently chooses to ignore it since it’s created in Windows, and then complains that it’s missing seconds later. Why does this happen? And how can I solve it?

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  1. Editorial Team

    Like matt commented above:

    The problem is that Bundler creates different Gemfile.locks for Windows. The only solution is to create and commit the lock file on a *NIX system.

    I would suggest to create a virtual machine running e.g. Ubuntu – maybe using Virtual Box. You can even get ready-to-use virtual machines – for example here.

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