--- a/testing/geckodriver/README.md
+++ b/testing/geckodriver/README.md
@@ -29,17 +29,17 @@ the [Testing :: GeckoDriver] component.
 [working with Mozilla source code]: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Source_Code
 [Testing :: geckodriver]: https://bugzilla.mozilla.org/buglist.cgi?product=Testing&component=geckodriver&resolution=---&list_id=13613952
 
 
 Supported clients
 =================
 
 [Selenium] users must update to [version
-3.4](https://github.com/SeleniumHQ/selenium/releases/tag/selenium-3.4.0)
+3.5](https://github.com/SeleniumHQ/selenium/releases/tag/selenium-3.5.0)
 or later to use geckodriver.  Other clients that follow the [W3C WebDriver
 specification] are also supported.
 
 [W3C WebDriver specification]: https://w3c.github.io/webdriver/webdriver-spec.html
 
 
 Supported Firefoxen
 ===================