diff --git a/appengine/standard/firebase/firenotes/backend/requirements.txt b/appengine/standard/firebase/firenotes/backend/requirements.txt
index e63566a21fa..ce7a48a4c72 100644
--- a/appengine/standard/firebase/firenotes/backend/requirements.txt
+++ b/appengine/standard/firebase/firenotes/backend/requirements.txt
@@ -1,6 +1,6 @@
 Flask==0.12.2
 pyjwt==1.5.2
-flask-cors==3.0.2
+flask-cors==3.0.3
 google-auth==1.0.1
 requests==2.18.1
 requests-toolbelt==0.8.0
diff --git a/endpoints/getting-started/requirements.txt b/endpoints/getting-started/requirements.txt
index 758ad1d7b5d..e5d76ff4695 100644
--- a/endpoints/getting-started/requirements.txt
+++ b/endpoints/getting-started/requirements.txt
@@ -1,5 +1,5 @@
 Flask==0.12.2
-flask-cors==3.0.2
+flask-cors==3.0.3
 gunicorn==19.7.1
 six==1.10.0
 pyyaml==3.12