diff --git a/module_api/requirements.txt b/module_api/requirements.txt
index 1adbf77..a8c7fa7 100644
--- a/module_api/requirements.txt
+++ b/module_api/requirements.txt
@@ -6,7 +6,7 @@
 # Note: The `lib` directory is added to `sys.path` by `appengine_config.py`.
 coverage==4.4.1
 feedparser==5.2.1
-Flask==0.12.2
+Flask==1.0
 GoogleAppEngineCloudStorageClient==1.9.22.1
 google-api-python-client==1.6.2
 mock==1.3.0