There is a low severity vulnerability in in the currently used version of RuboCop, which is fixed by using the latest version. Updating RuboCop is a good opportunity to update any other outdated dependency (all of them).

Just to notify in case some changes happened over time in capistrano;
I only managed to have working, wrapping it within default_env :

set :default_env, {
  'pg_password' => Figaro.env.pg_password,
  ...
}

Just having set :pg_password, Figaro.env.pg_password was not okay

Maybe I did some wrong somewhere and that seems obvious here ?

The following style issues from Code Climate should be fixed:

• Line is too long. [100/80]

  s.description   = 'This gem allows the usage of ENV variables from Figaro in Capistrano settings.’
  

  Found in capistrano-figaro.gemspec

• Prefer $INPUT_RECORD_SEPARATOR or $RS from the English library over $/.

  s.files         = `git ls-files`.split($/)
  

  Found in capistrano-figaro.gemspec

• Use snake_case for source file names.
  Found in lib/capistrano-figaro.rb

• File.exists? is deprecated in favor of File.exist?.

  unless File.exists?(fetch(:figaro_path))
  

  Found in lib/capistrano/tasks/figaro.rake

• Use fail instead of raise to signal exceptions.

  raise LoadError, 'Configuration file not found!’
  

  Found in lib/capistrano/tasks/figaro.rake