diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 8d122f6..e2b39f9 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -1,17 +1,3 @@
-# Copyright 2021 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
docker:
image: gcr.io/repo-automation-bots/owlbot-python:latest
- digest: sha256:c66ba3c8d7bc8566f47df841f98cd0097b28fff0b1864c86f5817f4c8c3e8600
+ digest: sha256:99d90d097e4a4710cc8658ee0b5b963f4426d0e424819787c3ac1405c9a26719
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 5fa18b9..cc5fa94 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -68,14 +68,9 @@ Using ``nox``
We use `nox `__ to instrument our tests.
- To test your changes, run unit tests with ``nox``::
+ $ nox -s unit
- $ nox -s unit-3.6
- $ nox -s unit-3.7
- $ nox -s unit-3.8
- $ nox -s unit-3.9
-
-- Args to pytest can be passed through the nox command separated by a `--`. For
- example, to run a single test::
+- To run a single unit test::
$ nox -s unit-3.9 -- -k
@@ -145,7 +140,7 @@ Running System Tests
- To run system tests, you can execute::
# Run all system tests
- $ nox -s system-3.8
+ $ nox -s system
# Run a single system test
$ nox -s system-3.8 -- -k