diff -u b/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php b/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
--- b/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
@@ -7,7 +7,7 @@
 /**
  * Runs a browser test using PhantomJS.
  *
- * @deprecated in Drupal 8.5.x, will be removed before Drupal 9.0.0.
+ * @deprecated in Drupal 8.6.x, will be removed before Drupal 9.0.0.
  * Use \Drupal\FunctionalJavascriptTests\WebDriverTestBase instead
  *
  * Base class for testing browser interaction implemented in JavaScript.
diff -u b/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php b/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php
--- b/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php
@@ -5,7 +5,7 @@
 /**
  * Runs a browser test using PhantomJS.
  *
- * @deprecated in Drupal 8.5.x, will be removed before Drupal 9.0.0.
+ * @deprecated in Drupal 8.6.x, will be removed before Drupal 9.0.0.
  * Use \Drupal\FunctionalJavascriptTests\WebDriverTestBase instead
  *
  * BC layer for testing browser interaction implemented in JavaScript.