diff --git a/functions/ocr/app/requirements.txt b/functions/ocr/app/requirements.txt
index 9d3bb524e16b..b1fc42fff812 100644
--- a/functions/ocr/app/requirements.txt
+++ b/functions/ocr/app/requirements.txt
@@ -1,4 +1,4 @@
-google-cloud-pubsub==1.0.0
+google-cloud-pubsub==1.4.2
 google-cloud-storage==1.26.0
 google-cloud-translate==2.0.1
 google-cloud-vision==1.0.0
diff --git a/functions/pubsub/requirements.txt b/functions/pubsub/requirements.txt
index 3dcf00f13bcf..d77820e64575 100644
--- a/functions/pubsub/requirements.txt
+++ b/functions/pubsub/requirements.txt
@@ -1 +1 @@
-google-cloud-pubsub==1.3.0
\ No newline at end of file
+google-cloud-pubsub==1.4.2
\ No newline at end of file
diff --git a/functions/tips/requirements.txt b/functions/tips/requirements.txt
index 47146c8ef8ee..c7db07f30d87 100644
--- a/functions/tips/requirements.txt
+++ b/functions/tips/requirements.txt
@@ -1,5 +1,5 @@
 google-cloud-error-reporting==0.33.0
-google-cloud-pubsub==1.1.0
+google-cloud-pubsub==1.4.2
 python-dateutil==2.8.1
 requests==2.23.0
 xmltodict==0.12.0
diff --git a/iot/api-client/end_to_end_example/requirements.txt b/iot/api-client/end_to_end_example/requirements.txt
index e83a1680c5bd..83b4d08a5117 100644
--- a/iot/api-client/end_to_end_example/requirements.txt
+++ b/iot/api-client/end_to_end_example/requirements.txt
@@ -2,6 +2,6 @@ cryptography==2.9
 google-api-python-client==1.8.0
 google-auth-httplib2==0.0.3
 google-auth==1.14.0
-google-cloud-pubsub==1.1.0
+google-cloud-pubsub==1.4.2
 pyjwt==1.7.1
 paho-mqtt==1.5.0
diff --git a/iot/api-client/gcs_file_to_device/requirements.txt b/iot/api-client/gcs_file_to_device/requirements.txt
index 713e85854dff..ff434b72b128 100644
--- a/iot/api-client/gcs_file_to_device/requirements.txt
+++ b/iot/api-client/gcs_file_to_device/requirements.txt
@@ -2,7 +2,7 @@ google-api-python-client==1.8.0
 google-auth==1.14.0
 google-auth-httplib2==0.0.3
 google-cloud-iot==1.0.0
-google-cloud-pubsub==1.0.0
+google-cloud-pubsub==1.4.2
 google-cloud-storage==1.26.0
 cryptography==2.9
 paho-mqtt==1.5.0
diff --git a/iot/api-client/http_example/requirements.txt b/iot/api-client/http_example/requirements.txt
index 4b126880a479..ebc7677d798d 100644
--- a/iot/api-client/http_example/requirements.txt
+++ b/iot/api-client/http_example/requirements.txt
@@ -3,6 +3,6 @@ google-api-python-client==1.8.0
 google-auth-httplib2==0.0.3
 google-auth==1.14.0
 google-cloud-iot==1.0.0
-google-cloud-pubsub==1.1.0
+google-cloud-pubsub==1.4.2
 pyjwt==1.7.1
 requests==2.23.0
diff --git a/iot/api-client/manager/requirements.txt b/iot/api-client/manager/requirements.txt
index 5918123f5435..c6087ae5b947 100644
--- a/iot/api-client/manager/requirements.txt
+++ b/iot/api-client/manager/requirements.txt
@@ -4,6 +4,6 @@ google-api-python-client==1.8.0
 google-auth-httplib2==0.0.3
 google-auth==1.14.0
 google-cloud-iot==1.0.0
-google-cloud-pubsub==1.1.0
+google-cloud-pubsub==1.4.2
 paho-mqtt==1.5.0
 pyjwt==1.7.1
diff --git a/iot/api-client/mqtt_example/requirements.txt b/iot/api-client/mqtt_example/requirements.txt
index 9b3661177238..5630624edb22 100644
--- a/iot/api-client/mqtt_example/requirements.txt
+++ b/iot/api-client/mqtt_example/requirements.txt
@@ -4,7 +4,7 @@ gcp-devrel-py-tools==0.0.15
 google-api-python-client==1.8.0
 google-auth-httplib2==0.0.3
 google-auth==1.14.0
-google-cloud-pubsub==1.0.0
+google-cloud-pubsub==1.4.2
 google-cloud-iot==1.0.0
 grpc-google-iam-v1==0.12.3
 pyjwt==1.7.1
diff --git a/iot/api-client/scripts/requirements.txt b/iot/api-client/scripts/requirements.txt
index a5a8b2bb921a..fbfc0f4d395e 100644
--- a/iot/api-client/scripts/requirements.txt
+++ b/iot/api-client/scripts/requirements.txt
@@ -1 +1 @@
-google-cloud-pubsub==1.1.0
+google-cloud-pubsub==1.4.2