diff --git a/webservices_rpi_arduino_comm/requirements.txt b/webservices_rpi_arduino_comm/requirements.txt
index 285161ff..eb33a7a4 100644
--- a/webservices_rpi_arduino_comm/requirements.txt
+++ b/webservices_rpi_arduino_comm/requirements.txt
@@ -26,7 +26,7 @@ enum34==1.1.6
 execnet==1.5.0
 flake8==2.4.0
 Flask==1.1.1
-Flask-Cors==3.0.2
+Flask-Cors==3.0.9
 funcsigs==1.0.2
 futures==3.2.0
 httmock==1.2.5