As it's possible that you manage the Ruby version by yourself we created the capistrano-opscomplete Gem to support you with this task.

As before, add the Gem to your Gemfile:

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gem 'capistrano-opscomplete', require: false

And again, actually install it by calling bundle:

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$ bundle

Now make the tasks the Gem provides available to you during deploy by adding the following to your Capfile:

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# Include opscomplete tasks
require 'capistrano/opscomplete'

Finally - also in the Capfile - add the following hook which checks if the Ruby version in your .ruby-version file is already available and install it, if that's not the case:

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# Install new Ruby version if not already installed
after 'deploy:updating', 'opscomplete:ruby:ensure'