diff --git a/requirements.txt b/requirements.txt
index 7bd0c66..2b37011 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ ruamel.yaml==0.15.100
 six==1.16.0
 sortedcontainers==1.5.10
 tinycss==0.4
-tornado==5.0.2
+tornado==6.3.3
 urllib3==1.22
 urwid==2.0.1
 wsproto==0.11.0