diff --git a/requirements.txt b/requirements.txt
index 2ae3e98..caf3494 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@
 # Note: The `lib` directory is added to `sys.path` by `appengine_config.py`.
 flask>=0.12.3
 pycountry==17.9.23
-flask-cors==3.0.3
+flask-cors==5.0.0
 flask-restplus==0.10.1