diff --git a/requirements.txt b/requirements.txt
index a279c60..ef2ea81 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ eth-utils==1.0.3
 ethereum==2.3.1
 etherscan==0.0.1
 Flask==1.0.2
-Flask-Cors==3.0.6
+Flask-Cors==3.0.9
 Flask-JSONRPC==0.3.1
 future==0.16.0
 gevent==1.3.7