diff --git a/requirements.txt b/requirements.txt
index 52430fb50..11ae2cb68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,4 +23,4 @@ requests==2.18.4
 six==1.10.0
 selenium==3.4.3
 SQLAlchemy==1.1.13
-tornado==4.5.2
+tornado==6.4.2