diff --git a/endpoints/bookstore-grpc/requirements.txt b/endpoints/bookstore-grpc/requirements.txt
index b65013d830ef..92cb11686c73 100644
--- a/endpoints/bookstore-grpc/requirements.txt
+++ b/endpoints/bookstore-grpc/requirements.txt
@@ -1,2 +1,2 @@
-grpcio==1.8.2
+grpcio==1.8.3
 google-auth==1.2.1
diff --git a/endpoints/getting-started-grpc/requirements.txt b/endpoints/getting-started-grpc/requirements.txt
index 1f0345db2119..510af983a871 100644
--- a/endpoints/getting-started-grpc/requirements.txt
+++ b/endpoints/getting-started-grpc/requirements.txt
@@ -1,2 +1,2 @@
-grpcio==1.8.2
-grpcio-tools==1.8.2
+grpcio==1.8.3
+grpcio-tools==1.8.3