Has ChromeDriver been updated on the Ubuntu 14.04 (Trusty) image?

#TL;DR

The problem was caused by the capybara-helper gem that installed another (newer) version of ChromeDriver.

We fixed it by disabling this gem on CircleCI with this modification to our Gemfile:

gem 'chromedriver-helper' unless ENV.key?('CIRCLECI')

Then we had to rebuild without cache to fix this error:

Selenium::WebDriver::Error::WebDriverError:
  unable to connect to chromedriver 127.0.0.1:9515
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