title: How can I determine my version of Selenium from the `selenium-webdriver` gem?
body: <p>Mozilla has <a href="https://firefox-source-docs.mozilla.org/testing/geckodriver/geckodriver/Support.html" rel="nofollow noreferrer">this handy chart</a> indicating which specific versions of geckodriver, selenium, and firefox work well together for automated browser testing.</p>
  
  <p><a href="https://i.stack.imgur.com/O5E9y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/O5E9y.png" alt="enter image description here"></a></p>
  
  <p>My version of geckodriver and firefox are easy enough to determine (<code>geckodriver --version</code> and <code>firefox --version</code>). </p>
  
  <p>But how do I find <strong>what version of "Selenium" is installed</strong> on my Ubuntu installation? </p>
  
  <p><strong>I am using the <a href="https://github.com/SeleniumHQ/selenium/tree/master/rb" rel="nofollow noreferrer"><code>selenium-webdriver</code></a> ruby gem</strong> that is officially supported by the SeleniumHQ project, so I'm not sure if that supports a way determining the Selenium library version it is using. </p>
  
  <p>Thanks!</p>