diff --git a/bigtable/hello/requirements.txt b/bigtable/hello/requirements.txt
index 8a8e837c14a..298e582fd8d 100644
--- a/bigtable/hello/requirements.txt
+++ b/bigtable/hello/requirements.txt
@@ -1,2 +1,2 @@
-google-cloud-bigtable==0.24.0
+google-cloud-bigtable==0.25.0
 google-cloud-core==0.25.0
diff --git a/bigtable/metricscaler/metricscaler.py b/bigtable/metricscaler/metricscaler.py
index 8a61ca3eb23..486795ce609 100644
--- a/bigtable/metricscaler/metricscaler.py
+++ b/bigtable/metricscaler/metricscaler.py
@@ -22,7 +22,6 @@
 from google.cloud import monitoring
 
 
-
 def get_cpu_load():
     """Returns the most recent Cloud Bigtable CPU load measurement.
 
@@ -51,23 +50,22 @@ def scale_bigtable(bigtable_instance, bigtable_cluster, scale_up):
            bigtable_cluster (str): Cloud Bigtable cluster ID to scale
            scale_up (bool): If true, scale up, otherwise scale down
     """
-    _MIN_NODE_COUNT = 3
-    """
-    The minimum number of nodes to use. The default minimum is 3. If you have a
-    lot of data, the rule of thumb is to not go below 2.5 TB per node for SSD
-    clusters, and 8 TB for HDD. The bigtable.googleapis.com/disk/bytes_used
-    metric is useful in figuring out the minimum number of nodes.
-    """
 
-    _MAX_NODE_COUNT = 30
-    """
-    The maximum number of nodes to use. The default maximum is 30 nodes per zone.
-    If you need more quota, you can request more by following the instructions
-    <a href="https://cloud.google.com/bigtable/quota">here</a>.
-    """
+    # The minimum number of nodes to use. The default minimum is 3. If you have
+    # a lot of data, the rule of thumb is to not go below 2.5 TB per node for
+    # SSD lusters, and 8 TB for HDD. The
+    # "bigtable.googleapis.com/disk/bytes_used" metric is useful in figuring
+    # out the minimum number of nodes.
+    min_node_count = 3
+
+    # The maximum number of nodes to use. The default maximum is 30 nodes per
+    # zone. If you need more quota, you can request more by following the
+    # instructions at https://cloud.google.com/bigtable/quota.
+    max_node_count = 30
+
+    # The number of nodes to change the cluster by.
+    size_change_step = 3
 
-    _SIZE_CHANGE_STEP = 3
-    """The number of nodes to change the cluster by."""
     # [START bigtable_scale]
     bigtable_client = bigtable.Client(admin=True)
     instance = bigtable_client.instance(bigtable_instance)
@@ -79,16 +77,16 @@ def scale_bigtable(bigtable_instance, bigtable_cluster, scale_up):
     current_node_count = cluster.serve_nodes
 
     if scale_up:
-        if current_node_count < _MAX_NODE_COUNT:
-            new_node_count = min(current_node_count + 3, _MAX_NODE_COUNT)
+        if current_node_count < max_node_count:
+            new_node_count = min(current_node_count + 3, max_node_count)
             cluster.serve_nodes = new_node_count
             cluster.update()
             print('Scaled up from {} to {} nodes.'.format(
                 current_node_count, new_node_count))
     else:
-        if current_node_count > _MIN_NODE_COUNT:
+        if current_node_count > min_node_count:
             new_node_count = max(
-                current_node_count - _SIZE_CHANGE_STEP, _MIN_NODE_COUNT)
+                current_node_count - size_change_step, min_node_count)
             cluster.serve_nodes = new_node_count
             cluster.update()
             print('Scaled down from {} to {} nodes.'.format(
diff --git a/bigtable/metricscaler/metricscaler_test.py b/bigtable/metricscaler/metricscaler_test.py
index 7a151a0efd2..76561ca6537 100644
--- a/bigtable/metricscaler/metricscaler_test.py
+++ b/bigtable/metricscaler/metricscaler_test.py
@@ -20,13 +20,13 @@
 from google.cloud import bigtable
 from mock import patch
 
-from metricscaler import _SIZE_CHANGE_STEP
 from metricscaler import get_cpu_load
 from metricscaler import main
 from metricscaler import scale_bigtable
 
 # tests assume instance and cluster have the same ID
 BIGTABLE_INSTANCE = os.environ['BIGTABLE_CLUSTER']
+SIZE_CHANGE_STEP = 3
 
 # System tests to verify API calls succeed
 
@@ -50,7 +50,7 @@ def test_scale_bigtable():
     cluster.reload()
 
     new_node_count = cluster.serve_nodes
-    assert (new_node_count == (original_node_count + _SIZE_CHANGE_STEP))
+    assert (new_node_count == (original_node_count + SIZE_CHANGE_STEP))
 
     scale_bigtable(BIGTABLE_INSTANCE, BIGTABLE_INSTANCE, False)
     time.sleep(3)
diff --git a/bigtable/metricscaler/requirements.txt b/bigtable/metricscaler/requirements.txt
index 480c67b2259..8153a027252 100644
--- a/bigtable/metricscaler/requirements.txt
+++ b/bigtable/metricscaler/requirements.txt
@@ -1,2 +1,2 @@
-google-cloud-bigtable==0.24.0
+google-cloud-bigtable==0.25.0
 google-cloud-monitoring==0.25.0
diff --git a/dataproc/requirements.txt b/dataproc/requirements.txt
index 6ae3a1ebee0..1219a36251c 100644
--- a/dataproc/requirements.txt
+++ b/dataproc/requirements.txt
@@ -1,2 +1,2 @@
 google-api-python-client==1.6.2
-google-cloud==0.25.0
+google-cloud==0.26.0
diff --git a/iot/api-client/manager/manager.py b/iot/api-client/manager/manager.py
index e8a755a5415..1b8a0439d67 100644
--- a/iot/api-client/manager/manager.py
+++ b/iot/api-client/manager/manager.py
@@ -51,7 +51,7 @@ def create_iot_topic(topic_name):
     topic = pubsub_client.topic(topic_name)
     policy = topic.get_iam_policy()
     publishers = policy.get('roles/pubsub.publisher', [])
-    publishers.append(policy.service_account(
+    publishers.add(policy.service_account(
             'cloud-iot@system.gserviceaccount.com'))
     policy['roles/pubsub.publisher'] = publishers
     topic.set_iam_policy(policy)
diff --git a/iot/api-client/manager/requirements.txt b/iot/api-client/manager/requirements.txt
index b54e248f0a1..28fa5657ad3 100644
--- a/iot/api-client/manager/requirements.txt
+++ b/iot/api-client/manager/requirements.txt
@@ -1,4 +1,4 @@
 google-api-python-client==1.6.2
 google-auth-httplib2==0.0.2
 google-auth==1.0.1
-google-cloud==0.25.0
+google-cloud==0.26.0