--- a/dom/media/test/external/requirements.txt
+++ b/dom/media/test/external/requirements.txt
@@ -12,9 +12,9 @@ moznetwork==0.27
 mozprocess==0.23
 mozprofile==0.28
 mozrunner==6.12
 moztest==0.7
 mozversion==1.4
 wptserve==1.3.0
 marionette-client==3.1.0
 marionette-driver==2.0.0
-firefox-puppeteer >= 50.0.0, <51.0.0
+firefox-puppeteer >= 51.0.0, <52.0.0

--- a/testing/firefox-ui/harness/requirements.txt
+++ b/testing/firefox-ui/harness/requirements.txt
@@ -1,5 +1,5 @@
-firefox-puppeteer >= 50.0.0, <51.0.0
+firefox-puppeteer >= 51.0.0, <52.0.0
 marionette-client >= 2.3.0
 mozfile >= 1.2
 mozinfo >= 0.8
 mozinstall >= 1.12

--- a/testing/puppeteer/firefox/firefox_puppeteer/__init__.py
+++ b/testing/puppeteer/firefox/firefox_puppeteer/__init__.py
@@ -4,17 +4,17 @@
 
 import os
 
 from marionette_driver.marionette import HTMLElement
 
 from decorators import use_class_as_property
 
 
-__version__ = '50.0.0'
+__version__ = '51.0.0'
 
 
 class Puppeteer(object):
     """The puppeteer class is used to expose libraries to test cases.
 
     example:
     `class MyTestCase(MarionetteTestCase, Puppeteer)`
 

--- a/testing/puppeteer/firefox/requirements.txt
+++ b/testing/puppeteer/firefox/requirements.txt
@@ -1,2 +1,2 @@
-marionette-driver >= 1.4.0
+marionette-driver >= 2.0.0
 mozinfo >= 0.8