--- a/taskcluster/ci/source-test/python-tests.yml
+++ b/taskcluster/ci/source-test/python-tests.yml
@@ -93,18 +93,17 @@ mozharness:
         implementation: docker-worker
         docker-image: {in-tree: "lint"}
         max-run-time: 1800
     run:
         using: run-task
         cache-dotcache: true
         command: >
             cd /home/worker/checkouts/gecko/testing/mozharness &&
-            /usr/bin/pip2 install tox &&
-            /home/worker/.local/bin/tox -e py27-hg4.1
+            /usr/local/bin/tox -e py27-hg4.1
     run-on-projects:
         - integration
         - release
     when:
         files-changed:
             - 'testing/mozharness/**'
 
 mozlint:

--- a/taskcluster/docker/lint/Dockerfile
+++ b/taskcluster/docker/lint/Dockerfile
@@ -14,16 +14,18 @@ ADD topsrcdir/testing/mozharness/externa
 # %include taskcluster/docker/recipes/install-node.sh
 ADD topsrcdir/taskcluster/docker/recipes/install-node.sh /build/install-node.sh
 
 # %include taskcluster/docker/recipes/install-mercurial.sh
 ADD topsrcdir/taskcluster/docker/recipes/install-mercurial.sh /build/install-mercurial.sh
 ADD system-setup.sh /tmp/system-setup.sh
 # %include tools/lint/flake8/flake8_requirements.txt
 ADD topsrcdir/tools/lint/flake8/flake8_requirements.txt /tmp/flake8_requirements.txt
+# %include tools/lint/tox/tox_requirements.txt
+ADD topsrcdir/tools/lint/tox/tox_requirements.txt /tmp/tox_requirements.txt
 RUN bash /tmp/system-setup.sh
 
 # %include taskcluster/docker/recipes/run-task
 ADD topsrcdir/taskcluster/docker/recipes/run-task /home/worker/bin/run-task
 RUN chown -R worker:worker /home/worker/bin && chmod 755 /home/worker/bin/*
 
 # Set variable normally configured at login, by the shells parent process, these
 # are taken from GNU su manual

--- a/taskcluster/docker/lint/system-setup.sh
+++ b/taskcluster/docker/lint/system-setup.sh
@@ -46,10 +46,18 @@ cd /build
 ###
 # Flake8 Setup
 ###
 
 cd /setup
 
 pip install --require-hashes -r /tmp/flake8_requirements.txt
 
+###
+# tox Setup
+###
+
+cd /setup
+
+pip install --require-hashes -r /tmp/tox_requirements.txt
+
 cd /
 rm -rf /setup

new file mode 100644
--- /dev/null
+++ b/tools/lint/tox/tox_requirements.txt
@@ -0,0 +1,4 @@
+pluggy==0.4.0 --hash=sha256:d2766caddfbbc8ef641d47da556d2ae3056860ce4d553aa04009e42b76a09951
+py==1.4.33 --hash=sha256:81b5e37db3cc1052de438375605fb5d3b3e97f950f415f9143f04697c684d7eb
+tox==2.7.0 --hash=sha256:0f37ea637ead4a5bbae91531b0bf8fd327c7152e20255e5960ee180598228d21
+virtualenv==15.1.0 --hash=sha256:39d88b533b422825d644087a21e78c45cf5af0ef7a99a1fc9fbb7b481e5c85b0