diff --git a/testing/web-platform/tests/tools/wptrunner/requirements_firefox.txt b/testing/web-platform/tests/tools/wptrunner/requirements_firefox.txt
index 8b06373b8870..5384f9e2a5d7 100644
--- a/testing/web-platform/tests/tools/wptrunner/requirements_firefox.txt
+++ b/testing/web-platform/tests/tools/wptrunner/requirements_firefox.txt
@@ -1,4 +1,4 @@
-marionette_driver == 2.5.0
+marionette_driver==2.6.0
 mozprofile == 0.29
 mozprocess == 0.26
 mozcrash == 1.0