bundle-inject man page
bundle-inject — Add named gem(s) with version requirements to Gemfile
bundle inject [GEM] [VERSION]
Adds the named gem(s) with their version requirements to the resolved Gemfile(5).
This command will add the gem to both your Gemfile(5) and Gemfile.lock if it isn´t listed yet.
bundle install bundle inject ´rack´ ´> 0´
This will inject the ´rack´ gem with a version greater than 0 in your Gemfile(5) and Gemfile.lock