bundle inject [GEM] [VERSION]
Adds the named gem(s) with their version requirements to the resolved [Gemfile(5)][Gemfile(5)].
This command will add the gem to both your [Gemfile(5)][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)][Gemfile(5)] and Gemfile.lock.
The bundle inject command was deprecated in Bundler 2.1 and will be removed in Bundler 3.0.