diff --git a/appengine/flexible/endpoints/requirements.txt b/appengine/flexible/endpoints/requirements.txt
index 9fb0ec81c46..e929789dd92 100644
--- a/appengine/flexible/endpoints/requirements.txt
+++ b/appengine/flexible/endpoints/requirements.txt
@@ -1,5 +1,5 @@
 Flask==0.11.1
-flask-cors==3.0.1
+flask-cors==3.0.2
 gunicorn==19.6.0
 gcloud==0.18.1
 six==1.10.0
diff --git a/appengine/standard/firebase/firenotes/backend/requirements.txt b/appengine/standard/firebase/firenotes/backend/requirements.txt
index 8f494f48720..bbbafa1103e 100644
--- a/appengine/standard/firebase/firenotes/backend/requirements.txt
+++ b/appengine/standard/firebase/firenotes/backend/requirements.txt
@@ -1,3 +1,3 @@
 Flask==0.11.1
 pyjwt==1.4.2
-flask-cors==3.0.1
+flask-cors==3.0.2
diff --git a/requirements-dev.txt b/requirements-dev.txt
index fd8c9a70901..737be70e73d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,7 @@ coverage==4.2
 cryptography==1.5
 Django==1.10.1
 flaky==3.3.0
-flask-cors==3.0.1
+flask-cors==3.0.2
 Flask-Sockets==0.2.1
 Flask-SQLAlchemy==2.1
 Flask==0.11.1