diff --git a/samples/snippets/publisher.py b/samples/snippets/publisher.py
index d527b54cb..465047560 100644
--- a/samples/snippets/publisher.py
+++ b/samples/snippets/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/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index 7aa8ce1fb..f2fc2b4a2 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -1 +1 @@
-google-cloud-pubsub==0.20.0
+google-cloud-pubsub==0.21.0
diff --git a/samples/snippets/subscriber.py b/samples/snippets/subscriber.py
index b4fdd9573..9a564496e 100644
--- a/samples/snippets/subscriber.py
+++ b/samples/snippets/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)