diff --git a/.kokoro/test-samples-impl.sh b/.kokoro/test-samples-impl.sh
index 53e365bc4..55910c8ba 100755
--- a/.kokoro/test-samples-impl.sh
+++ b/.kokoro/test-samples-impl.sh
@@ -33,8 +33,7 @@ export PYTHONUNBUFFERED=1
 env | grep KOKORO
 
 # Install nox
-# `virtualenv==20.26.6` is added for Python 3.7 compatibility
-python3.9 -m pip install --upgrade --quiet nox virtualenv==20.26.6
+python3.9 -m pip install --upgrade --quiet nox
 
 # Use secrets acessor service account to get secrets
 if [[ -f "${KOKORO_GFILE_DIR}/secrets_viewer_service_account.json" ]]; then
diff --git a/samples/beam/noxfile.py b/samples/beam/noxfile.py
index 8ae94fd44..80ffdb178 100644
--- a/samples/beam/noxfile.py
+++ b/samples/beam/noxfile.py
@@ -22,6 +22,7 @@
 
 import nox
 
+
 # WARNING - WARNING - WARNING - WARNING - WARNING
 # WARNING - WARNING - WARNING - WARNING - WARNING
 #           DO NOT EDIT THIS FILE EVER!
@@ -157,7 +158,6 @@ def blacken(session: nox.sessions.Session) -> None:
 # format = isort + black
 #
 
-
 @nox.session
 def format(session: nox.sessions.Session) -> None:
     """
@@ -185,9 +185,7 @@ def _session_tests(
     session: nox.sessions.Session, post_install: Callable = None
 ) -> None:
     # check for presence of tests
-    test_list = glob.glob("**/*_test.py", recursive=True) + glob.glob(
-        "**/test_*.py", recursive=True
-    )
+    test_list = glob.glob("**/*_test.py", recursive=True) + glob.glob("**/test_*.py", recursive=True)
     test_list.extend(glob.glob("**/tests", recursive=True))
 
     if len(test_list) == 0:
@@ -209,7 +207,9 @@ def _session_tests(
 
     if os.path.exists("requirements-test.txt"):
         if os.path.exists("constraints-test.txt"):
-            session.install("-r", "requirements-test.txt", "-c", "constraints-test.txt")
+            session.install(
+                "-r", "requirements-test.txt", "-c", "constraints-test.txt"
+            )
         else:
             session.install("-r", "requirements-test.txt")
         with open("requirements-test.txt") as rtfile:
@@ -222,9 +222,9 @@ def _session_tests(
         post_install(session)
 
     if "pytest-parallel" in packages:
-        concurrent_args.extend(["--workers", "auto", "--tests-per-worker", "auto"])
+        concurrent_args.extend(['--workers', 'auto', '--tests-per-worker', 'auto'])
     elif "pytest-xdist" in packages:
-        concurrent_args.extend(["-n", "auto"])
+        concurrent_args.extend(['-n', 'auto'])
 
     session.run(
         "pytest",
@@ -254,7 +254,7 @@ def py(session: nox.sessions.Session) -> None:
 
 
 def _get_repo_root() -> Optional[str]:
-    """Returns the root folder of the project."""
+    """ Returns the root folder of the project. """
     # Get root of this repository. Assume we don't have directories nested deeper than 10 items.
     p = Path(os.getcwd())
     for i in range(10):