diff --git a/requirements-dev.txt b/requirements-dev.txt
index 5c425cc607e3e..275ace3c5f76b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -19,7 +19,7 @@ coverage==4.5.3
 flake8-import-order==0.18.1
 flake8-mypy==17.8.0
 flake8==3.7.7
-flask-cors==3.0.7
+flask-cors==3.0.9
 ipdb==0.12
 mypy==0.670
 nose==1.3.7