diff --git a/appengine/standard/flask/hello_world/README.md b/appengine/standard/flask/hello_world/README.md
index 04ec9402ab14..e2749c87e56c 100644
--- a/appengine/standard/flask/hello_world/README.md
+++ b/appengine/standard/flask/hello_world/README.md
@@ -3,9 +3,4 @@
 This sample shows how to use [Flask](http://flask.pocoo.org/) with Google App
 Engine Standard.
 
-Before running or deploying this application, install the dependencies using
-[pip](http://pip.readthedocs.io/en/stable/):
-
-    pip install -t lib -r requirements.txt
-
 For more information, see the [App Engine Standard README](../../README.md)
diff --git a/appengine/standard/flask/hello_world/app.yaml b/appengine/standard/flask/hello_world/app.yaml
index f041d384c057..c8d42601d937 100644
--- a/appengine/standard/flask/hello_world/app.yaml
+++ b/appengine/standard/flask/hello_world/app.yaml
@@ -5,3 +5,8 @@ threadsafe: true
 handlers:
 - url: /.*
   script: main.app
+
+# Using flask as a built-in third-party library
+libraries:
+- name: flask
+  version: latest
diff --git a/appengine/standard/flask/hello_world/appengine_config.py b/appengine/standard/flask/hello_world/appengine_config.py
deleted file mode 100644
index c903d9a0ac5e..000000000000
--- a/appengine/standard/flask/hello_world/appengine_config.py
+++ /dev/null
@@ -1,18 +0,0 @@
-# Copyright 2016 Google Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from google.appengine.ext import vendor
-
-# Add any libraries installed in the "lib" folder.
-vendor.add('lib')
diff --git a/appengine/standard/flask/hello_world/requirements.txt b/appengine/standard/flask/hello_world/requirements.txt
deleted file mode 100644
index 52ab1a390198..000000000000
--- a/appengine/standard/flask/hello_world/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-Flask==0.12.2
diff --git a/testing/requirements.txt b/testing/requirements.txt
index e51938b0d193..8ba942671a95 100644
--- a/testing/requirements.txt
+++ b/testing/requirements.txt
@@ -15,3 +15,4 @@ webapp2==2.5.2
 google-api-python-client==1.6.4
 google-cloud-core==0.28.0
 gcp-devrel-py-tools==0.0.11
+flask==0.12