Run bundle lock –update. I found an answer in a blog post by Chris Blunt: “Rails on Docker: Quickly Create or Update Your Gemfile.lock”: Today, I discovered a way to save the hours wasted downloading gems: bundler’s lock command. This gem of a command resolves your app’s dependencies and writes out the appropriate Gemfile.lock – … Read more
This happened to me and git reset –hard HEAD from the accepted answer didn’t help. However, running spring stop did the trick. I suspect spring is rewriting the file whenever it is modified to ensure that it is in sync with the code running via spring.
The Gemfile is where you specify which gems you want to use, and lets you specify which versions. The Gemfile.lock file is where Bundler records the exact versions that were installed. This way, when the same library/project is loaded on another machine, running bundle install will look at the Gemfile.lock and install the exact same … Read more
You can find more about it in the bundler website (emphasis added below for your convenience): After developing your application for a while, check in the application together with the Gemfile and Gemfile.lock snapshot. Now, your repository has a record of the exact versions of all of the gems that you used the last time … Read more