diff --git a/benchtester/MarionetteTest.py b/benchtester/MarionetteTest.py
index 6c437ae..229e064 100644
--- a/benchtester/MarionetteTest.py
+++ b/benchtester/MarionetteTest.py
@@ -12,7 +12,7 @@
 import shutil
 
 import mozprofile
-from marionette.runtests import MarionetteTestRunner
+from marionette_harness.runtests import MarionetteTestRunner
 
 
 class MarionetteTest(BenchTester.BenchTest):
diff --git a/benchtester/test_memory_usage.py b/benchtester/test_memory_usage.py
index b01281c..8b74337 100644
--- a/benchtester/test_memory_usage.py
+++ b/benchtester/test_memory_usage.py
@@ -6,7 +6,7 @@
 import os
 import sys
 
-from marionette import MarionetteTestCase
+from marionette_harness import MarionetteTestCase
 from marionette_driver import Actions
 from marionette_driver.errors import JavascriptException, ScriptTimeoutException
 import mozlog.structured
diff --git a/requirements.txt b/requirements.txt
index 048c394..4beee5e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 boto==2.39.0
-marionette-client==3.1.0
+marionette-harness=4.0.0
 mercurial==3.2.4
 mozdownload==1.20.2
 MozillaPulse==1.0.1
diff --git a/setup.py b/setup.py
index 8d557f0..87ad03c 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@
     packages=["benchtester"],
     install_requires=[
       "boto",
-      "marionette-client",
+      "marionette-harness",
       "mercurial",
       "mozdownload",
       "MozillaPulse",