gem install bundler-audited_update
You probably don't want to add this to your Gemfile.
Run audited_bundle_update
This will run a bundle update, display the changelog for each gem upgraded, then show you a summary view of changes for each gem.
Example output:
# Gem Changes
## Added Gems
* rails 5.2.0: https://github.com/rails/rails
## Upgraded Gems
### Major Upgrades
* byebug (9.1.0 -> 10.0.0): No impact
### Minor Upgrades
* capybara (2.17.0 -> 2.18.0): May help with flaky test XYZ.
### Point Upgrades
* bullet (5.7.1 -> 5.7.3): No impact.