diff --git a/bigquery/datalab-migration/requirements.txt b/bigquery/datalab-migration/requirements.txt
index 508d423a0a5a..9d73f0b3c103 100644
--- a/bigquery/datalab-migration/requirements.txt
+++ b/bigquery/datalab-migration/requirements.txt
@@ -1,4 +1,4 @@
-grpcio==1.27.2
+grpcio==1.28.1
 google-cloud-bigquery[pandas,pyarrow]==1.24.0
 datalab==1.2.0
 ipython==7.2.0; python_version > "2.7"
diff --git a/dataproc/requirements.txt b/dataproc/requirements.txt
index cc78ad4cc214..3a3427b5a505 100644
--- a/dataproc/requirements.txt
+++ b/dataproc/requirements.txt
@@ -1,4 +1,4 @@
-grpcio==1.27.2
+grpcio==1.28.1
 google-auth==1.11.2
 google-auth-httplib2==0.0.3
 google-cloud==0.34.0
diff --git a/endpoints/bookstore-grpc-transcoding/requirements.txt b/endpoints/bookstore-grpc-transcoding/requirements.txt
index 77382948ad1d..6f3c139aa806 100644
--- a/endpoints/bookstore-grpc-transcoding/requirements.txt
+++ b/endpoints/bookstore-grpc-transcoding/requirements.txt
@@ -1,4 +1,4 @@
-grpcio==1.27.2
+grpcio==1.28.1
 grpcio-tools==1.28.1
 google-auth==1.11.2
 six==1.14.0
diff --git a/endpoints/bookstore-grpc/requirements.txt b/endpoints/bookstore-grpc/requirements.txt
index 7b01d3bf5e5b..f6c5729deae4 100644
--- a/endpoints/bookstore-grpc/requirements.txt
+++ b/endpoints/bookstore-grpc/requirements.txt
@@ -1,4 +1,4 @@
-grpcio==1.27.2
+grpcio==1.28.1
 grpcio-tools==1.28.1
 google-auth==1.11.2
 six==1.14.0
diff --git a/endpoints/getting-started-grpc/requirements.txt b/endpoints/getting-started-grpc/requirements.txt
index 4ab28f321a6a..8f32c7e57ed4 100644
--- a/endpoints/getting-started-grpc/requirements.txt
+++ b/endpoints/getting-started-grpc/requirements.txt
@@ -1,2 +1,2 @@
-grpcio==1.27.2
+grpcio==1.28.1
 grpcio-tools==1.28.1
diff --git a/opencensus/requirements.txt b/opencensus/requirements.txt
index a7e4a346b289..274c061ca6a6 100644
--- a/opencensus/requirements.txt
+++ b/opencensus/requirements.txt
@@ -1,3 +1,3 @@
-grpcio==1.27.2
+grpcio==1.28.1
 opencensus-ext-stackdriver==0.7.2
 opencensus==0.7.7
diff --git a/trace/cloud-trace-demo-app/app/requirements.txt b/trace/cloud-trace-demo-app/app/requirements.txt
index 55f001f2cf73..af74a224ab6b 100644
--- a/trace/cloud-trace-demo-app/app/requirements.txt
+++ b/trace/cloud-trace-demo-app/app/requirements.txt
@@ -5,5 +5,5 @@ Flask==1.1.2
 opencensus-ext-stackdriver==0.7.2
 opencensus-ext-flask==0.7.3
 opencensus-context==0.1.1
-grpcio==1.27.2
+grpcio==1.28.1
 httpretty==1.0.2