diff --git a/samples/api-client/manager/manager_test.py b/samples/api-client/manager/manager_test.py
index 20bac093..7291e1f3 100644
--- a/samples/api-client/manager/manager_test.py
+++ b/samples/api-client/manager/manager_test.py
@@ -41,7 +41,7 @@
 pubsub_topic = 'projects/{}/topics/{}'.format(project_id, topic_id)
 
 # This format is used in the `clean_up_registries()` below.
-registry_id = 'test-registry-{}-{}'.format(uuid.uuid1(), int(time.time()))
+registry_id = 'test-registry-{}-{}'.format(uuid.uuid4().hex, int(time.time()))
 
 
 @pytest.fixture(scope="session", autouse=True)