- gem 'minitest', '~> 5.0'
- gem 'selenium-webdriver'
- gem 'capybara'
- gem 'poltergeist'
- gem 'headless'
+ gem 'minitest', '~> 5.10.3'
+ # Selenium-webdriver 3.x is producing problems like the one described here:
+ # https://stackoverflow.com/questions/41310586/ruby-selenium-webdriver-unable-to-find-mozilla-geckodriver
+ gem 'selenium-webdriver', '~> 2.53.1'
+ gem 'capybara', '~> 2.5.0'
+ gem 'poltergeist', '~> 1.5.1'
+ gem 'headless', '~> 1.0.2'