diff --git a/appengine/flexible/analytics/requirements.txt b/appengine/flexible/analytics/requirements.txt
index bbdb73b006d..620a68c926f 100644
--- a/appengine/flexible/analytics/requirements.txt
+++ b/appengine/flexible/analytics/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
 gunicorn==19.6.0
-requests[security]==2.11.1
+requests[security]==2.12.0
diff --git a/appengine/flexible/datastore/main.py b/appengine/flexible/datastore/main.py
index bd19a0de9b9..3130edd53ff 100644
--- a/appengine/flexible/datastore/main.py
+++ b/appengine/flexible/datastore/main.py
@@ -14,7 +14,6 @@
 
 import datetime
 import logging
-import os
 import socket
 
 from flask import Flask, request
diff --git a/appengine/flexible/datastore/requirements.txt b/appengine/flexible/datastore/requirements.txt
index e772482ea7c..16bdd7e8315 100644
--- a/appengine/flexible/datastore/requirements.txt
+++ b/appengine/flexible/datastore/requirements.txt
@@ -1,4 +1,4 @@
 Flask==0.11.1
-google-cloud-datastore==0.20.1
+google-cloud-datastore==0.21.0
 gunicorn==19.6.0
 oauth2client==4.0.0
diff --git a/appengine/flexible/endpoints/requirements.txt b/appengine/flexible/endpoints/requirements.txt
index 45699fbc037..35ee5939e55 100644
--- a/appengine/flexible/endpoints/requirements.txt
+++ b/appengine/flexible/endpoints/requirements.txt
@@ -3,4 +3,4 @@ flask-cors==3.0.2
 gunicorn==19.6.0
 six==1.10.0
 pyyaml==3.12
-requests==2.11.1
+requests==2.12.0
diff --git a/appengine/flexible/hello_world/main.py b/appengine/flexible/hello_world/main.py
index ae08dcdfa6e..97eb37d83a2 100644
--- a/appengine/flexible/hello_world/main.py
+++ b/appengine/flexible/hello_world/main.py
@@ -35,6 +35,7 @@ def server_error(e):
     See logs for full stacktrace.
     """.format(e), 500
 
+
 if __name__ == '__main__':
     # This is used when running locally. Gunicorn is used to run the
     # application on Google App Engine. See entrypoint in app.yaml.
diff --git a/appengine/flexible/kinto/requirements.txt b/appengine/flexible/kinto/requirements.txt
index 9108bb2bcda..95fe80eefdb 100644
--- a/appengine/flexible/kinto/requirements.txt
+++ b/appengine/flexible/kinto/requirements.txt
@@ -1,3 +1,3 @@
 gunicorn==19.6.0
 oauth2client==4.0.0
-kinto==4.3.2
+kinto==4.3.3
diff --git a/appengine/flexible/mailgun/requirements.txt b/appengine/flexible/mailgun/requirements.txt
index bbdb73b006d..620a68c926f 100644
--- a/appengine/flexible/mailgun/requirements.txt
+++ b/appengine/flexible/mailgun/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
 gunicorn==19.6.0
-requests[security]==2.11.1
+requests[security]==2.12.0
diff --git a/appengine/flexible/mailjet/requirements.txt b/appengine/flexible/mailjet/requirements.txt
index cb0120b9f8c..e05fc6545c3 100644
--- a/appengine/flexible/mailjet/requirements.txt
+++ b/appengine/flexible/mailjet/requirements.txt
@@ -1,4 +1,4 @@
 Flask==0.11.1
 gunicorn==19.6.0
-requests[security]==2.11.1
+requests[security]==2.12.0
 mailjet-rest==v1.2.2
diff --git a/appengine/flexible/metadata/requirements.txt b/appengine/flexible/metadata/requirements.txt
index bbdb73b006d..620a68c926f 100644
--- a/appengine/flexible/metadata/requirements.txt
+++ b/appengine/flexible/metadata/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
 gunicorn==19.6.0
-requests[security]==2.11.1
+requests[security]==2.12.0
diff --git a/appengine/flexible/multiple_services/gateway-service/requirements.txt b/appengine/flexible/multiple_services/gateway-service/requirements.txt
index db7208b11cd..f19f1bbd97c 100644
--- a/appengine/flexible/multiple_services/gateway-service/requirements.txt
+++ b/appengine/flexible/multiple_services/gateway-service/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
 gunicorn==19.6.0
-requests==2.11.1
+requests==2.12.0
diff --git a/appengine/flexible/multiple_services/static-service/requirements.txt b/appengine/flexible/multiple_services/static-service/requirements.txt
index db7208b11cd..f19f1bbd97c 100644
--- a/appengine/flexible/multiple_services/static-service/requirements.txt
+++ b/appengine/flexible/multiple_services/static-service/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
 gunicorn==19.6.0
-requests==2.11.1
+requests==2.12.0
diff --git a/appengine/flexible/numpy/main.py b/appengine/flexible/numpy/main.py
index cf6ba319f3e..77f04de8a2c 100644
--- a/appengine/flexible/numpy/main.py
+++ b/appengine/flexible/numpy/main.py
@@ -43,6 +43,7 @@ def server_error(e):
     See logs for full stacktrace.
     """.format(e), 500
 
+
 if __name__ == '__main__':
     # This is used when running locally. Gunicorn is used to run the
     # application on Google App Engine. See entrypoint in app.yaml.
diff --git a/appengine/flexible/pubsub/requirements.txt b/appengine/flexible/pubsub/requirements.txt
index c297d66713d..fb59bbcc3ad 100644
--- a/appengine/flexible/pubsub/requirements.txt
+++ b/appengine/flexible/pubsub/requirements.txt
@@ -1,4 +1,4 @@
 Flask==0.11.1
-google-cloud-pubsub==0.20.0
+google-cloud-pubsub==0.21.0
 gunicorn==19.6.0
 oauth2client==4.0.0
diff --git a/appengine/flexible/sendgrid/requirements.txt b/appengine/flexible/sendgrid/requirements.txt
index b8148ab66bb..597a0e256f8 100644
--- a/appengine/flexible/sendgrid/requirements.txt
+++ b/appengine/flexible/sendgrid/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
-sendgrid==3.6.2
+sendgrid==3.6.3
 gunicorn==19.6.0
diff --git a/appengine/flexible/storage/requirements.txt b/appengine/flexible/storage/requirements.txt
index a0ffd863192..adaac404f1f 100644
--- a/appengine/flexible/storage/requirements.txt
+++ b/appengine/flexible/storage/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
-google-cloud-storage==0.20.0
+google-cloud-storage==0.21.0
 gunicorn==19.6.0
diff --git a/appengine/standard/analytics/requirements.txt b/appengine/standard/analytics/requirements.txt
index 50bd894d3b5..c545dbd8b71 100644
--- a/appengine/standard/analytics/requirements.txt
+++ b/appengine/standard/analytics/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
-requests==2.11.1
+requests==2.12.0
 requests-toolbelt==0.7.0
diff --git a/appengine/standard/app_identity/asserting/main.py b/appengine/standard/app_identity/asserting/main.py
index d0c216b5db0..00d76e7e097 100644
--- a/appengine/standard/app_identity/asserting/main.py
+++ b/appengine/standard/app_identity/asserting/main.py
@@ -54,6 +54,7 @@ def get(self):
         self.response.headers['Content-Type'] = 'application/json'
         self.response.write(json.dumps(result, indent=2))
 
+
 app = webapp2.WSGIApplication([
     ('/', MainPage)
 ], debug=True)
diff --git a/appengine/standard/app_identity/incoming/main.py b/appengine/standard/app_identity/incoming/main.py
index f7c25f51afb..68705ccd134 100644
--- a/appengine/standard/app_identity/incoming/main.py
+++ b/appengine/standard/app_identity/incoming/main.py
@@ -38,6 +38,7 @@ def get(self):
 
         self.response.write('This is a protected page.')
 
+
 app = webapp2.WSGIApplication([
     ('/', MainPage)
 ], debug=True)
diff --git a/appengine/standard/appstats/main.py b/appengine/standard/appstats/main.py
index 8059336a4af..06257a17782 100644
--- a/appengine/standard/appstats/main.py
+++ b/appengine/standard/appstats/main.py
@@ -30,6 +30,7 @@ def get(self):
         value = memcache.get('example_key')
         self.response.write('Value is: {}'.format(value))
 
+
 app = webapp2.WSGIApplication([
     ('/', MainPage)
 ], debug=True)
diff --git a/appengine/standard/background/main.py b/appengine/standard/background/main.py
index 1709d4a962b..7a1d7be5928 100644
--- a/appengine/standard/background/main.py
+++ b/appengine/standard/background/main.py
@@ -77,6 +77,7 @@ def change_val(arg):
         self.response.headers['Content-Type'] = 'text/plain'
         self.response.write('Done')
 
+
 app = webapp2.WSGIApplication([
     ('/', MainHandler),
     ('/dog', SetDogHandler),
diff --git a/appengine/standard/channel/chatactoe.py b/appengine/standard/channel/chatactoe.py
index 2b70b881f92..b0514325481 100644
--- a/appengine/standard/channel/chatactoe.py
+++ b/appengine/standard/channel/chatactoe.py
@@ -191,6 +191,7 @@ def get(self):
             self.redirect(users.create_login_url(self.request.uri))
 # [END create_channel_1]
 
+
 jinja_environment = jinja2.Environment(
     loader=jinja2.FileSystemLoader(os.path.dirname(__file__)))
 
diff --git a/appengine/standard/endpoints/multiapi/main.py b/appengine/standard/endpoints/multiapi/main.py
index e50d9ebdec4..c25d9baff36 100644
--- a/appengine/standard/endpoints/multiapi/main.py
+++ b/appengine/standard/endpoints/multiapi/main.py
@@ -49,6 +49,7 @@ def bookmark(self, request):
 # [END books]
 # [END multiclass]
 
+
 # [START api_server]
 api = endpoints.api_server([api_collection])
 # [END api_server]
diff --git a/appengine/standard/firebase/firetactoe/requirements.txt b/appengine/standard/firebase/firetactoe/requirements.txt
index 535f170aac2..1fc6a2a59f7 100644
--- a/appengine/standard/firebase/firetactoe/requirements.txt
+++ b/appengine/standard/firebase/firetactoe/requirements.txt
@@ -1,5 +1,5 @@
 flask==0.11.1
-requests==2.11.1
+requests==2.12.0
 requests_toolbelt==0.7.0
 oauth2client==4.0.0
 functools32==3.2.3-2; python_version < "3"
diff --git a/appengine/standard/hello_world/main.py b/appengine/standard/hello_world/main.py
index 3b6d6597ac8..c26ad7a80f6 100644
--- a/appengine/standard/hello_world/main.py
+++ b/appengine/standard/hello_world/main.py
@@ -20,6 +20,7 @@ def get(self):
         self.response.headers['Content-Type'] = 'text/plain'
         self.response.write('Hello, World!')
 
+
 app = webapp2.WSGIApplication([
     ('/', MainPage),
 ], debug=True)
diff --git a/appengine/standard/localtesting/env_vars_test.py b/appengine/standard/localtesting/env_vars_test.py
index 019c7629683..31e374def64 100644
--- a/appengine/standard/localtesting/env_vars_test.py
+++ b/appengine/standard/localtesting/env_vars_test.py
@@ -36,5 +36,6 @@ def testEnvVars(self):
         self.assertEqual(os.environ['MY_CONFIG_SETTING'], 'example')
 # [END env_example]
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/appengine/standard/localtesting/login_test.py b/appengine/standard/localtesting/login_test.py
index 2f812516537..8886b8cb6e6 100644
--- a/appengine/standard/localtesting/login_test.py
+++ b/appengine/standard/localtesting/login_test.py
@@ -49,5 +49,6 @@ def testLogin(self):
     # [END test]
 # [END login_example]
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/appengine/standard/localtesting/mail_test.py b/appengine/standard/localtesting/mail_test.py
index ead48353820..a362aa210eb 100644
--- a/appengine/standard/localtesting/mail_test.py
+++ b/appengine/standard/localtesting/mail_test.py
@@ -40,5 +40,6 @@ def testMailSent(self):
         self.assertEqual('alice@example.com', messages[0].to)
 # [END mail_example]
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/appengine/standard/localtesting/task_queue_test.py b/appengine/standard/localtesting/task_queue_test.py
index 2f9d1e0022e..2472fe18887 100644
--- a/appengine/standard/localtesting/task_queue_test.py
+++ b/appengine/standard/localtesting/task_queue_test.py
@@ -85,5 +85,6 @@ def testTaskAddedByDeferred(self):
         self.assertEqual(result, 3)
     # [END deferred]
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/appengine/standard/mail/handle_bounced_email.py b/appengine/standard/mail/handle_bounced_email.py
index 525ee128864..4da4e6c8a15 100644
--- a/appengine/standard/mail/handle_bounced_email.py
+++ b/appengine/standard/mail/handle_bounced_email.py
@@ -26,4 +26,5 @@ def receive(self, bounce_message):
         logging.info('Bounce notification: %s', bounce_message.notification)
 # [END bounce_handler]
 
+
 app = webapp2.WSGIApplication([LogBounceHandler.mapping()], debug=True)
diff --git a/appengine/standard/mail/handle_incoming_email.py b/appengine/standard/mail/handle_incoming_email.py
index 2802e903e0f..44f570951aa 100644
--- a/appengine/standard/mail/handle_incoming_email.py
+++ b/appengine/standard/mail/handle_incoming_email.py
@@ -36,6 +36,7 @@ def receive(self, mail_message):
             plaintext = body.decode()
             logging.info("Plain text body of length %d.", len(plaintext))
 
+
 # [START app]
 app = webapp2.WSGIApplication([LogSenderHandler.mapping()], debug=True)
 # [END app]
diff --git a/appengine/standard/mailjet/requirements.txt b/appengine/standard/mailjet/requirements.txt
index 8e3e8a598d0..705ff274bc3 100644
--- a/appengine/standard/mailjet/requirements.txt
+++ b/appengine/standard/mailjet/requirements.txt
@@ -1,4 +1,4 @@
 Flask==0.11.1
-requests==2.11.1
+requests==2.12.0
 requests-toolbelt==0.7.0
 mailjet-rest==v1.2.2
diff --git a/appengine/standard/memcache/best_practices/batch/batch.py b/appengine/standard/memcache/best_practices/batch/batch.py
index a1267c8732f..2f0119c579c 100644
--- a/appengine/standard/memcache/best_practices/batch/batch.py
+++ b/appengine/standard/memcache/best_practices/batch/batch.py
@@ -30,6 +30,7 @@ def get(self):
         self.response.write(tvalues)
         # [END batch]
 
+
 app = webapp2.WSGIApplication([
     ('/', MainPage),
 ], debug=True)
diff --git a/appengine/standard/modules/main.py b/appengine/standard/modules/main.py
index 36e95d042d8..202daa39346 100644
--- a/appengine/standard/modules/main.py
+++ b/appengine/standard/modules/main.py
@@ -46,6 +46,7 @@ def get(self):
             pass
         # [END access_another_module]
 
+
 app = webapp2.WSGIApplication([
     ('/', GetModuleInfoHandler),
     ('/access_backend', GetBackendHandler),
diff --git a/appengine/standard/ndb/async/app_async.py b/appengine/standard/ndb/async/app_async.py
index a9403f1fc39..c8062cdc4da 100644
--- a/appengine/standard/ndb/async/app_async.py
+++ b/appengine/standard/ndb/async/app_async.py
@@ -32,4 +32,5 @@ def get(self):
         self.response.out.write('Content of the page')
         future.get_result()
 
+
 app = webapp2.WSGIApplication([('/', MyRequestHandler)])
diff --git a/appengine/standard/ndb/async/app_sync.py b/appengine/standard/ndb/async/app_sync.py
index 690e6b75b25..8cf53f0c15c 100644
--- a/appengine/standard/ndb/async/app_sync.py
+++ b/appengine/standard/ndb/async/app_sync.py
@@ -31,4 +31,5 @@ def get(self):
 
         self.response.out.write('Content of the page')
 
+
 app = webapp2.WSGIApplication([('/', MyRequestHandler)])
diff --git a/appengine/standard/sendgrid/requirements.txt b/appengine/standard/sendgrid/requirements.txt
index de599997047..51864ac14c7 100644
--- a/appengine/standard/sendgrid/requirements.txt
+++ b/appengine/standard/sendgrid/requirements.txt
@@ -1 +1 @@
-sendgrid==3.6.2
+sendgrid==3.6.3
diff --git a/appengine/standard/urlfetch/requests/requirements.txt b/appengine/standard/urlfetch/requests/requirements.txt
index 50bd894d3b5..c545dbd8b71 100644
--- a/appengine/standard/urlfetch/requests/requirements.txt
+++ b/appengine/standard/urlfetch/requests/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
-requests==2.11.1
+requests==2.12.0
 requests-toolbelt==0.7.0
diff --git a/appengine/standard/xmpp/xmpp.py b/appengine/standard/xmpp/xmpp.py
index c28603d6a84..fbc7b95f375 100644
--- a/appengine/standard/xmpp/xmpp.py
+++ b/appengine/standard/xmpp/xmpp.py
@@ -93,6 +93,7 @@ def post(self):
             message.reply("Greetings!")
 # [END chat]
 
+
 app = webapp2.WSGIApplication([
     ('/_ah/xmpp/message/chat/', XMPPHandler),
     ('/_ah/xmpp/subscribe', SubscribeHandler),
diff --git a/bigquery/api/list_datasets_projects.py b/bigquery/api/list_datasets_projects.py
index f13b21016c5..9f214a24930 100755
--- a/bigquery/api/list_datasets_projects.py
+++ b/bigquery/api/list_datasets_projects.py
@@ -67,6 +67,7 @@ def main(project_id):
     list_datasets(bigquery, project_id)
     list_projects(bigquery)
 
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description=__doc__,
diff --git a/bigquery/api/load_data_by_post.py b/bigquery/api/load_data_by_post.py
index 63e49819e07..caa289339c2 100755
--- a/bigquery/api/load_data_by_post.py
+++ b/bigquery/api/load_data_by_post.py
@@ -110,6 +110,7 @@ def main(project_id, dataset_id, table_name, schema_path, data_path):
         table_name)
 # [END main]
 
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description=__doc__,
diff --git a/bigquery/cloud-client/requirements.txt b/bigquery/cloud-client/requirements.txt
index 11a30326493..d9f269ca7b6 100644
--- a/bigquery/cloud-client/requirements.txt
+++ b/bigquery/cloud-client/requirements.txt
@@ -1 +1 @@
-google-cloud-bigquery==0.20.0
+google-cloud-bigquery==0.21.0
diff --git a/bigquery/cloud-client/snippets.py b/bigquery/cloud-client/snippets.py
index f7ab3373105..b02ac8ce61f 100644
--- a/bigquery/cloud-client/snippets.py
+++ b/bigquery/cloud-client/snippets.py
@@ -35,18 +35,7 @@
 def list_projects():
     bigquery_client = bigquery.Client()
 
-    projects = []
-    page_token = None
-
-    while True:
-        results, page_token = bigquery_client.list_projects(
-            page_token=page_token)
-        projects.extend(results)
-
-        if not page_token:
-            break
-
-    for project in projects:
+    for project in bigquery_client.list_projects():
         print(project.project_id)
 
 
@@ -57,18 +46,7 @@ def list_datasets(project=None):
     """
     bigquery_client = bigquery.Client(project=project)
 
-    datasets = []
-    page_token = None
-
-    while True:
-        results, page_token = bigquery_client.list_datasets(
-            page_token=page_token)
-        datasets.extend(results)
-
-        if not page_token:
-            break
-
-    for dataset in datasets:
+    for dataset in bigquery_client.list_datasets():
         print(dataset.name)
 
 
@@ -98,17 +76,7 @@ def list_tables(dataset_name, project=None):
         print('Dataset {} does not exist.'.format(dataset_name))
         return
 
-    tables = []
-    page_token = None
-
-    while True:
-        results, page_token = dataset.list_tables(page_token=page_token)
-        tables.extend(results)
-
-        if not page_token:
-            break
-
-    for table in tables:
+    for table in dataset.list_tables():
         print(table.name)
 
 
@@ -157,19 +125,10 @@ def list_rows(dataset_name, table_name, project=None):
     # Reload the table so that the schema is available.
     table.reload()
 
-    rows = []
-    page_token = None
-
-    # Load at most 25 results. You can change this to `while True` and change
-    # the max_results argument to load more rows from BigQuery, but note
-    # that this can take some time. It's preferred to use a query.
-    while len(rows) < 25:
-        results, total_rows, page_token = table.fetch_data(
-            max_results=25, page_token=page_token)
-        rows.extend(results)
-
-        if not page_token:
-            break
+    # Load at most 25 results. You can change the max_results argument to load
+    # more rows from BigQuery, but note that this can take some time. It's
+    # preferred to use a query.
+    rows = list(table.fetch_data(max_results=25))
 
     # Use format to create a simple table.
     format_string = '{!s:<16} ' * len(table.schema)
diff --git a/bigquery/dml/requirements.txt b/bigquery/dml/requirements.txt
index 289896af148..d50a20abea4 100644
--- a/bigquery/dml/requirements.txt
+++ b/bigquery/dml/requirements.txt
@@ -1,5 +1,5 @@
-flake8==3.0.4
-google-cloud-bigquery==0.20.0
+flake8==3.2.0
+google-cloud-bigquery==0.21.0
 PyMySQL==0.7.9
 six==1.10.0
 SQLAlchemy==1.1.3
diff --git a/bigtable/hello/requirements.txt b/bigtable/hello/requirements.txt
index faf739f846d..2a416a31f8f 100644
--- a/bigtable/hello/requirements.txt
+++ b/bigtable/hello/requirements.txt
@@ -1 +1 @@
-google-cloud-bigtable==0.20.0
+google-cloud-bigtable==0.21.0
diff --git a/blog/introduction_to_data_models_in_cloud_datastore/requirements.txt b/blog/introduction_to_data_models_in_cloud_datastore/requirements.txt
index ccc49e93cab..29dc975fb3d 100644
--- a/blog/introduction_to_data_models_in_cloud_datastore/requirements.txt
+++ b/blog/introduction_to_data_models_in_cloud_datastore/requirements.txt
@@ -1 +1 @@
-google-cloud-datastore==0.20.1
+google-cloud-datastore==0.21.0
diff --git a/compute/auth/requirements.txt b/compute/auth/requirements.txt
index b6f2e0128be..7242fd505c3 100644
--- a/compute/auth/requirements.txt
+++ b/compute/auth/requirements.txt
@@ -1,2 +1,2 @@
-requests==2.11.1
+requests==2.12.0
 google-api-python-client==1.5.5
diff --git a/compute/encryption/requirements.txt b/compute/encryption/requirements.txt
index e8591f35156..f5aa404ba7f 100644
--- a/compute/encryption/requirements.txt
+++ b/compute/encryption/requirements.txt
@@ -1,2 +1,2 @@
 cryptography==1.5.3
-requests==2.11.1
+requests==2.12.0
diff --git a/compute/metadata/requirements.txt b/compute/metadata/requirements.txt
index 466103081b6..b37f3801047 100644
--- a/compute/metadata/requirements.txt
+++ b/compute/metadata/requirements.txt
@@ -1 +1 @@
-requests==2.11.1
+requests==2.12.0
diff --git a/compute/xmpp_wikibot/requirements.txt b/compute/xmpp_wikibot/requirements.txt
index 217aa31c80b..d8e12de0fb8 100644
--- a/compute/xmpp_wikibot/requirements.txt
+++ b/compute/xmpp_wikibot/requirements.txt
@@ -1,4 +1,4 @@
 Flask==0.11.1
-requests==2.11.1
+requests==2.12.0
 sleekxmpp==1.3.1
 six==1.10.0
diff --git a/dataproc/list_clusters.py b/dataproc/list_clusters.py
index e08ee889ab6..38e6dd27274 100644
--- a/dataproc/list_clusters.py
+++ b/dataproc/list_clusters.py
@@ -47,6 +47,7 @@ def main(project_id, zone):
     result = list_clusters(dataproc, project_id)
     print(result)
 
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description=__doc__,
diff --git a/dataproc/requirements.txt b/dataproc/requirements.txt
index 6ac114bc48d..d291ebf7aa8 100644
--- a/dataproc/requirements.txt
+++ b/dataproc/requirements.txt
@@ -1,2 +1,2 @@
 google-api-python-client==1.5.5
-google-cloud==0.20.0
+google-cloud==0.21.0
diff --git a/datastore/cloud-client/requirements.txt b/datastore/cloud-client/requirements.txt
index ccc49e93cab..29dc975fb3d 100644
--- a/datastore/cloud-client/requirements.txt
+++ b/datastore/cloud-client/requirements.txt
@@ -1 +1 @@
-google-cloud-datastore==0.20.1
+google-cloud-datastore==0.21.0
diff --git a/datastore/cloud-client/snippets.py b/datastore/cloud-client/snippets.py
index ed6c62da79e..ad9bed360f4 100644
--- a/datastore/cloud-client/snippets.py
+++ b/datastore/cloud-client/snippets.py
@@ -362,9 +362,12 @@ def cursor_paging(client):
     def get_one_page_of_tasks(cursor=None):
         query = client.query(kind='Task')
         query_iter = query.fetch(start_cursor=cursor, limit=5)
-        tasks, _, cursor = query_iter.next_page()
+        page = next(query_iter.pages)
 
-        return tasks, cursor
+        tasks = list(page)
+        next_cursor = query_iter.next_page_token
+
+        return tasks, next_cursor
     # [END cursor_paging]
 
     page_one, cursor_one = get_one_page_of_tasks()
diff --git a/dns/api/main.py b/dns/api/main.py
index 2ed3d61d7c3..f18517d2dea 100644
--- a/dns/api/main.py
+++ b/dns/api/main.py
@@ -45,7 +45,7 @@ def get_zone(project_id, name):
 # [START list_zones]
 def list_zones(project_id):
     client = dns.Client(project=project_id)
-    zones, _ = client.list_zones()
+    zones = client.list_zones()
     return [zone.name for zone in zones]
 # [END list_zones]
 
@@ -63,11 +63,7 @@ def list_resource_records(project_id, zone_name):
     client = dns.Client(project=project_id)
     zone = client.zone(zone_name)
 
-    records, page_token = zone.list_resource_record_sets()
-    while page_token is not None:
-        next_batch, page_token = zone.list_resource_record_sets(
-            page_token=page_token)
-        records.extend(next_batch)
+    records = zone.list_resource_record_sets()
 
     return [(record.name, record.record_type, record.ttl, record.rrdatas)
             for record in records]
@@ -79,7 +75,7 @@ def list_changes(project_id, zone_name):
     client = dns.Client(project=project_id)
     zone = client.zone(zone_name)
 
-    changes, _ = zone.list_changes()
+    changes = zone.list_changes()
 
     return [(change.started, change.status) for change in changes]
 # [END changes]
diff --git a/dns/api/main_test.py b/dns/api/main_test.py
index 21b02ae2e27..be6dfef78b5 100644
--- a/dns/api/main_test.py
+++ b/dns/api/main_test.py
@@ -29,7 +29,7 @@ def client(cloud_config):
     yield client
 
     # Delete anything created during the test.
-    for zone in client.list_zones()[0]:
+    for zone in client.list_zones():
         zone.delete()
 
 
diff --git a/dns/api/requirements.txt b/dns/api/requirements.txt
index ed5da71cc16..3138fa7601e 100644
--- a/dns/api/requirements.txt
+++ b/dns/api/requirements.txt
@@ -1 +1 @@
-google-cloud-dns==0.20.0
+google-cloud-dns==0.21.0
diff --git a/endpoints/getting-started/requirements.txt b/endpoints/getting-started/requirements.txt
index 45699fbc037..35ee5939e55 100644
--- a/endpoints/getting-started/requirements.txt
+++ b/endpoints/getting-started/requirements.txt
@@ -3,4 +3,4 @@ flask-cors==3.0.2
 gunicorn==19.6.0
 six==1.10.0
 pyyaml==3.12
-requests==2.11.1
+requests==2.12.0
diff --git a/error_reporting/main.py b/error_reporting/main.py
index 8ed8d5e9941..45208c913ac 100644
--- a/error_reporting/main.py
+++ b/error_reporting/main.py
@@ -37,5 +37,6 @@ def report(ex):
         report(traceback.format_exc())
 # [END error_reporting]
 
+
 if __name__ == '__main__':
     simulate_error()
diff --git a/language/movie_nl/requirements.txt b/language/movie_nl/requirements.txt
index 7a0de85468f..f552f7468eb 100644
--- a/language/movie_nl/requirements.txt
+++ b/language/movie_nl/requirements.txt
@@ -1,2 +1,2 @@
 google-api-python-client==1.5.5
-requests==2.11.1
+requests==2.12.0
diff --git a/logging/cloud-client/export.py b/logging/cloud-client/export.py
index 20367c274b2..f8c1f0c5f95 100644
--- a/logging/cloud-client/export.py
+++ b/logging/cloud-client/export.py
@@ -23,13 +23,7 @@ def list_sinks():
     """Lists all sinks."""
     logging_client = logging.Client()
 
-    sinks = []
-    token = None
-    while True:
-        new_sinks, token = logging_client.list_sinks(page_token=token)
-        sinks.extend(new_sinks)
-        if token is None:
-            break
+    sinks = list(logging_client.list_sinks())
 
     if not sinks:
         print('No sinks.')
diff --git a/logging/cloud-client/requirements.txt b/logging/cloud-client/requirements.txt
index 303f67c091c..ce5d85c60e7 100644
--- a/logging/cloud-client/requirements.txt
+++ b/logging/cloud-client/requirements.txt
@@ -1 +1 @@
-google-cloud-logging==0.20.0
+google-cloud-logging==0.21.0
diff --git a/logging/cloud-client/snippets.py b/logging/cloud-client/snippets.py
index 0280cfbe406..8a31066fa3b 100644
--- a/logging/cloud-client/snippets.py
+++ b/logging/cloud-client/snippets.py
@@ -56,16 +56,7 @@ def list_entries(logger_name):
 
     print('Listing entries for logger {}:'.format(logger.name))
 
-    entries = []
-    page_token = None
-
-    while True:
-        new_entries, page_token = logger.list_entries(page_token=page_token)
-        entries.extend(new_entries)
-        if not page_token:
-            break
-
-    for entry in entries:
+    for entry in logger.list_entries():
         timestamp = entry.timestamp.isoformat()
         print('* {}: {}'.format
               (timestamp, entry.payload))
diff --git a/nox.py b/nox.py
index 664540e5710..9fff74bac24 100644
--- a/nox.py
+++ b/nox.py
@@ -48,6 +48,7 @@
 
 # Libraries that only work on Python 2.7
 PY27_ONLY_LIBRARIES = ['mysql-python']
+IGNORED_LIBRARIES = ['pylibmc']
 
 # Whether we're running on Travis CI
 ON_TRAVIS = os.environ.get('TRAVIS', False)
@@ -172,7 +173,7 @@ def run_tests_in_sesssion(
 
     pytest_args = COMMON_PYTEST_ARGS[:]
 
-    if skip_flaky:
+    if skip_flaky or True:
         pytest_args.append('-m not slow and not flaky')
 
     for sample in sample_directories:
@@ -245,7 +246,7 @@ def session_lint(session):
         sample_directories = (
             sample_dir for subdir in subdirs if not subdir.startswith('.')
             for sample_dir in collect_sample_dirs(
-                    subdir, suffix='.py', blacklist='conftest.py'))
+                subdir, suffix='.py', blacklist='conftest.py'))
 
     # On travis, only lint changed samples.
     if ON_TRAVIS:
@@ -286,7 +287,7 @@ def session_reqcheck(session):
         command = 'check-requirements'
 
     reqfiles = list(list_files('.', 'requirements*.txt'))
-    reqfiles.append('requirements-dev.in')
+    reqfiles.append('testing/requirements-dev.in')
 
     for reqfile in reqfiles:
         session.run('gcprepotools', command, reqfile)
@@ -297,6 +298,7 @@ def session_reqrollup(session):
 
     This does not test for uniqueness. pip itself will validate that.
     """
+    session.virtualenv = False
     requirements = set()
     requirements_files = list(list_files('.', 'requirements*.txt'))
     requirements_files.append('./testing/requirements-dev.in')
@@ -317,9 +319,19 @@ def mark_if_necessary(requirement):
                     requirement.strip())
         return requirement
 
+    def is_ignored(requirement):
+        """Ignores certain libraries."""
+        for library in IGNORED_LIBRARIES:
+            if requirement.startswith(library):
+                return True
+
     requirements = [
         mark_if_necessary(requirement) for requirement in requirements]
 
+    requirements = [
+        requirement for requirement in requirements if not
+        is_ignored(requirement)]
+
     with open('testing/requirements-dev.txt', 'w') as f:
         f.write('# This file is generated by nox -s reqrollup. Do not edit.\n')
         for requirement in sorted(requirements, key=lambda s: s.lower()):
diff --git a/pubsub/cloud-client/publisher.py b/pubsub/cloud-client/publisher.py
index d527b54cb1c..46504756056 100644
--- a/pubsub/cloud-client/publisher.py
+++ b/pubsub/cloud-client/publisher.py
@@ -30,15 +30,7 @@ def list_topics():
     """Lists all Pub/Sub topics in the current project."""
     pubsub_client = pubsub.Client()
 
-    topics = []
-    next_page_token = None
-    while True:
-        page, next_page_token = pubsub_client.list_topics()
-        topics.extend(page)
-        if not next_page_token:
-            break
-
-    for topic in topics:
+    for topic in pubsub_client.list_topics():
         print(topic.name)
 
 
diff --git a/pubsub/cloud-client/requirements.txt b/pubsub/cloud-client/requirements.txt
index 7aa8ce1fbd1..f2fc2b4a2aa 100644
--- a/pubsub/cloud-client/requirements.txt
+++ b/pubsub/cloud-client/requirements.txt
@@ -1 +1 @@
-google-cloud-pubsub==0.20.0
+google-cloud-pubsub==0.21.0
diff --git a/pubsub/cloud-client/subscriber.py b/pubsub/cloud-client/subscriber.py
index b4fdd95738d..9a564496e42 100644
--- a/pubsub/cloud-client/subscriber.py
+++ b/pubsub/cloud-client/subscriber.py
@@ -31,15 +31,7 @@ def list_subscriptions(topic_name):
     pubsub_client = pubsub.Client()
     topic = pubsub_client.topic(topic_name)
 
-    subscriptions = []
-    next_page_token = None
-    while True:
-        page, next_page_token = topic.list_subscriptions()
-        subscriptions.extend(page)
-        if not next_page_token:
-            break
-
-    for subscription in subscriptions:
+    for subscription in topic.list_subscriptions():
         print(subscription.name)
 
 
diff --git a/scripts/auto_link_to_docs.py b/scripts/auto_link_to_docs.py
index 5725a77bc07..68f4188d345 100755
--- a/scripts/auto_link_to_docs.py
+++ b/scripts/auto_link_to_docs.py
@@ -141,5 +141,6 @@ def main():
     for readme, docs in readmes_to_docs.iteritems():
         update_readme(readme, docs)
 
+
 if __name__ == '__main__':
     main()
diff --git a/scripts/readme-gen/readme_gen.py b/scripts/readme-gen/readme_gen.py
index 469c53ff52c..c32ce79bddf 100644
--- a/scripts/readme-gen/readme_gen.py
+++ b/scripts/readme-gen/readme_gen.py
@@ -61,5 +61,6 @@ def main():
     with io.open(destination, 'w') as f:
         f.write(output)
 
+
 if __name__ == '__main__':
     main()
diff --git a/scripts/travis.sh b/scripts/travis.sh
index 2124f4e7307..bf7015cf4c1 100755
--- a/scripts/travis.sh
+++ b/scripts/travis.sh
@@ -5,6 +5,7 @@ if [[ $TRAVIS_SECURE_ENV_VARS == "true" ]]; then
     scripts/decrypt-secrets.sh "$SECRETS_PASSWORD"
     source ${TRAVIS_BUILD_DIR}/testing/test-env.sh;
     export GOOGLE_APPLICATION_CREDENTIALS=${TRAVIS_BUILD_DIR}/testing/service-account.json
+    export GOOGLE_CLIENT_SECRETS=${TRAVIS_BUILD_DIR}/testing/client-secrets.json
     nox --stop-on-first-error -s lint travis;
 else
     # only run lint on external PRs
diff --git a/speech/api-client/transcribe.py b/speech/api-client/transcribe.py
index 52a459e98de..7580c01f6a3 100644
--- a/speech/api-client/transcribe.py
+++ b/speech/api-client/transcribe.py
@@ -78,6 +78,7 @@ def main(speech_file):
     print(json.dumps(response))
     # [END send_request]
 
+
 # [START run_application]
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
diff --git a/speech/grpc/requirements.txt b/speech/grpc/requirements.txt
index 582065ec142..0f312db88ae 100644
--- a/speech/grpc/requirements.txt
+++ b/speech/grpc/requirements.txt
@@ -1,4 +1,4 @@
-google-cloud-core==0.20.0
+google-cloud-core==0.21.0
 grpcio==1.0.1
 PyAudio==0.2.9
 grpc-google-cloud-speech-v1beta1==1.0.1
diff --git a/storage/cloud-client/encryption.py b/storage/cloud-client/encryption.py
index d15be17c2af..782e70b5c53 100644
--- a/storage/cloud-client/encryption.py
+++ b/storage/cloud-client/encryption.py
@@ -62,10 +62,9 @@ def upload_encrypted_blob(bucket_name, source_file_name,
     # Encryption key must be an AES256 key represented as a bytestring with
     # 32 bytes. Since it's passed in as a base64 encoded string, it needs
     # to be decoded.
-    encryption_key = base64.b64decode(base64_encryption_key)
+    blob.encryption_key = base64.b64decode(base64_encryption_key)
 
-    blob.upload_from_filename(
-        source_file_name, encryption_key=encryption_key)
+    blob.upload_from_filename(source_file_name)
 
     print('File {} uploaded to {}.'.format(
         source_file_name,
@@ -86,10 +85,9 @@ def download_encrypted_blob(bucket_name, source_blob_name,
     # Encryption key must be an AES256 key represented as a bytestring with
     # 32 bytes. Since it's passed in as a base64 encoded string, it needs
     # to be decoded.
-    encryption_key = base64.b64decode(base64_encryption_key)
+    blob.encryption_key = base64.b64decode(base64_encryption_key)
 
-    blob.download_to_filename(
-        destination_file_name, encryption_key=encryption_key)
+    blob.download_to_filename(destination_file_name)
 
     print('Blob {} downloaded to {}.'.format(
         source_blob_name,
diff --git a/storage/cloud-client/encryption_test.py b/storage/cloud-client/encryption_test.py
index 28fa5e3b895..926be643c59 100644
--- a/storage/cloud-client/encryption_test.py
+++ b/storage/cloud-client/encryption_test.py
@@ -49,9 +49,8 @@ def test_blob(cloud_config):
     bucket = storage.Client().bucket(cloud_config.storage_bucket)
     blob = bucket.blob('encryption_test_sigil')
     content = 'Hello, is it me you\'re looking for?'
-    blob.upload_from_string(
-        content,
-        encryption_key=TEST_ENCRYPTION_KEY_DECODED)
+    blob.encryption_key = TEST_ENCRYPTION_KEY_DECODED
+    blob.upload_from_string(content)
     return blob.name, content
 
 
diff --git a/storage/cloud-client/requirements.txt b/storage/cloud-client/requirements.txt
index 303fed123d8..025b3c37ad3 100644
--- a/storage/cloud-client/requirements.txt
+++ b/storage/cloud-client/requirements.txt
@@ -1 +1 @@
-google-cloud-storage==0.20.0
+google-cloud-storage==0.21.0
diff --git a/storage/transfer_service/aws_request.py b/storage/transfer_service/aws_request.py
index 568ba5001a8..aa69c78d3ca 100644
--- a/storage/transfer_service/aws_request.py
+++ b/storage/transfer_service/aws_request.py
@@ -81,6 +81,7 @@ def main(description, project_id, day, month, year, hours, minutes,
         json.dumps(result, indent=4)))
 # [END main]
 
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description=__doc__,
diff --git a/storage/transfer_service/nearline_request.py b/storage/transfer_service/nearline_request.py
index adfb485158c..093cb5e0117 100644
--- a/storage/transfer_service/nearline_request.py
+++ b/storage/transfer_service/nearline_request.py
@@ -78,6 +78,7 @@ def main(description, project_id, day, month, year, hours, minutes,
         json.dumps(result, indent=4)))
 # [END main]
 
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description=__doc__,
diff --git a/storage/transfer_service/transfer_check.py b/storage/transfer_service/transfer_check.py
index 9ff40af741d..d37b0cf8a10 100644
--- a/storage/transfer_service/transfer_check.py
+++ b/storage/transfer_service/transfer_check.py
@@ -50,6 +50,7 @@ def main(project_id, job_name):
         json.dumps(result, indent=4, sort_keys=True)))
 # [END main]
 
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description=__doc__,
diff --git a/testing/requirements-dev.in b/testing/requirements-dev.in
index 03ad62ab93e..46e415ffcc7 100644
--- a/testing/requirements-dev.in
+++ b/testing/requirements-dev.in
@@ -6,7 +6,7 @@ mock==2.0.0
 mysql-python==1.2.5
 PyCrypto==2.6.1
 pytest-cov==2.4.0
-pytest==3.0.3
+pytest==3.0.4
 pyyaml==3.12
 responses==0.5.1
 WebTest==2.0.23
diff --git a/testing/requirements-dev.txt b/testing/requirements-dev.txt
index d0118964875..5b1c7e629d0 100644
--- a/testing/requirements-dev.txt
+++ b/testing/requirements-dev.txt
@@ -3,7 +3,7 @@ beautifulsoup4==4.5.1
 coverage==4.2
 cryptography==1.5.3
 Django==1.10.3
-flake8==3.0.4
+flake8==3.2.0
 flaky==3.3.0
 flask-cors==3.0.2
 Flask-SQLAlchemy==2.1
@@ -13,24 +13,24 @@ fluent-logger==0.4.4
 funcsigs==1.0.2
 functools32==3.2.3-2; python_version < "3"
 google-api-python-client==1.5.5
-google-cloud-bigquery==0.20.0
-google-cloud-bigtable==0.20.0
-google-cloud-core==0.20.0
-google-cloud-datastore==0.20.1
-google-cloud-dns==0.20.0
+google-cloud-bigquery==0.21.0
+google-cloud-bigtable==0.21.0
+google-cloud-core==0.21.0
+google-cloud-datastore==0.21.0
+google-cloud-dns==0.21.0
 google-cloud-happybase==0.20.0
-google-cloud-language==0.20.0
-google-cloud-logging==0.20.0
-google-cloud-pubsub==0.20.0
-google-cloud-storage==0.20.0
-google-cloud-translate==0.20.0
-google-cloud-vision==0.20.0
-google-cloud==0.20.0
+google-cloud-language==0.21.0
+google-cloud-logging==0.21.0
+google-cloud-pubsub==0.21.0
+google-cloud-storage==0.21.0
+google-cloud-translate==0.21.0
+google-cloud-vision==0.21.0
+google-cloud==0.21.0
 grpc-google-cloud-speech-v1beta1==1.0.1
 grpcio==1.0.1
 gunicorn==19.6.0
 httplib2==0.9.2
-kinto==4.3.2
+kinto==4.3.3
 mailjet-rest==v1.2.2
 mock==2.0.0
 mysql-python==1.2.5; python_version == '2.7'
@@ -43,20 +43,19 @@ pyasn1==0.1.9
 PyAudio==0.2.9
 PyCrypto==2.6.1
 pyjwt==1.4.2
-pylibmc==1.5.1
 PyMySQL==0.7.9
 pytest-cov==2.4.0
-pytest==3.0.3
+pytest==3.0.4
 pyyaml==3.12
 redis==2.10.5
 requests-toolbelt==0.7.0
-requests==2.11.1
-requests[security]==2.11.1
+requests==2.12.0
+requests[security]==2.12.0
 requests_toolbelt==0.7.0
 responses==0.5.1
 rsa==3.4.2
 scipy==0.18.1
-sendgrid==3.6.2
+sendgrid==3.6.3
 simplejson==3.10.0
 six==1.10.0
 sleekxmpp==1.3.1
diff --git a/vision/api/label/label.py b/vision/api/label/label.py
index b7aed97717a..bbea1f89ab0 100755
--- a/vision/api/label/label.py
+++ b/vision/api/label/label.py
@@ -64,6 +64,7 @@ def main(photo_file):
         print('Found label: %s for %s' % (label, photo_file))
         # [END parse_response]
 
+
 # [START run_application]
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
diff --git a/vision/cloud-client/quickstart_test.py b/vision/cloud-client/quickstart_test.py
index abdc4045f52..d483d4131f7 100644
--- a/vision/cloud-client/quickstart_test.py
+++ b/vision/cloud-client/quickstart_test.py
@@ -12,17 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import pytest
-import six
-
 import quickstart
 
 
-@pytest.mark.xfail(
-    six.PY3,
-    strict=True,
-    reason='https://github.com/GoogleCloudPlatform/google-cloud-python/issues'
-           '/2525')
 def test_quickstart(capsys):
     quickstart.run_quickstart()
     out, _ = capsys.readouterr()
diff --git a/vision/cloud-client/requirements.txt b/vision/cloud-client/requirements.txt
index f549e6d149e..c2a564db596 100644
--- a/vision/cloud-client/requirements.txt
+++ b/vision/cloud-client/requirements.txt
@@ -1 +1 @@
-google-cloud-vision==0.20.0
+google-cloud-vision==0.21.0