diff --git a/doc/source/contributor/testing.rst b/doc/source/contributor/testing.rst
index 8dde16d09..7299c4d60 100644
--- a/doc/source/contributor/testing.rst
+++ b/doc/source/contributor/testing.rst
@@ -15,7 +15,7 @@ Unit tests
 
 All unit tests should be run using `tox`_. Before running the unit tests, you
 should download the latest `watcher`_ from the github. To run the same unit
-tests that are executing onto `Gerrit`_ which includes ``py35``, ``py27`` and
+tests that are executing onto `Gerrit`_ which includes ``py36``, ``py37`` and
 ``pep8``, you can issue the following command::
 
     $ git clone https://opendev.org/openstack/watcher
@@ -26,8 +26,8 @@ tests that are executing onto `Gerrit`_ which includes ``py35``, ``py27`` and
 If you only want to run one of the aforementioned, you can then issue one of
 the following::
 
-    $ tox -e py35
-    $ tox -e py27
+    $ tox -e py36
+    $ tox -e py37
     $ tox -e pep8
 
 .. _tox: https://tox.readthedocs.org/
@@ -38,7 +38,7 @@ If you only want to run specific unit test code and don't like to waste time
 waiting for all unit tests to execute, you can add parameters ``--`` followed
 by a regex string::
 
-    $ tox -e py27 -- watcher.tests.api
+    $ tox -e py37 -- watcher.tests.api
 
 .. _tempest_tests: