diff --git a/endpoints/bookstore-grpc/requirements.txt b/endpoints/bookstore-grpc/requirements.txt
index 6d2c8a4704e..72c45986a27 100644
--- a/endpoints/bookstore-grpc/requirements.txt
+++ b/endpoints/bookstore-grpc/requirements.txt
@@ -1,2 +1,2 @@
-grpcio==1.9.0
+grpcio==1.9.1
 google-auth==1.3.0
diff --git a/endpoints/getting-started-grpc/requirements.txt b/endpoints/getting-started-grpc/requirements.txt
index 0f54881cf34..4425e3fe49f 100644
--- a/endpoints/getting-started-grpc/requirements.txt
+++ b/endpoints/getting-started-grpc/requirements.txt
@@ -1,2 +1,2 @@
-grpcio==1.9.0
-grpcio-tools==1.9.0
+grpcio==1.9.1
+grpcio-tools==1.9.1