Calling bundle update (without arguments) updates all your gems at once. Given that many gems don't care about stable APIs, this might break your application in a million ways.

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To stay sane, update your gems using the applicable way below:

Projects in active development

Update the entire bundle regularily (e.g. once a week). This ensures that your libraries are up-to-date while it's easy to spot major version bumps which may break the app.

Projects that have not been updated in a while

1. Update a single gem conservatively
2. Run tests
3. Deal with the pain
4. Update the next gem

It's also advisable to only update gems for a good reason (security fixes, new features you want), unless you like pain.