diff --git a/python-requirements/notebook-requirements.txt b/python-requirements/notebook-requirements.txt
index 9be7bf1..fee24bd 100644
--- a/python-requirements/notebook-requirements.txt
+++ b/python-requirements/notebook-requirements.txt
@@ -9,7 +9,7 @@ jupyter_contrib_nbextensions==0.4.0
 scipy==1.0.0
 # On Macs may need to comment out /usr/X11/include/freetype2 before compiling matplotlib
 matplotlib==2.1.2
-tornado==4.5.3
+tornado==5.0.2
 pyzmq==16.0.4
 mpld3==0.3
 fabric==1.14.0