diff --git a/requirements.txt b/requirements.txt
index 60bfeccb95..c8ed0179ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ urllib3==1.24.3
 # note: simplejson is used in many checks to inteface APIs
 simplejson==3.6.5
 supervisor==3.3.3
-tornado==3.2.2
+tornado==6.5.5
 uptime==3.0.1
 prometheus-client==0.1.0
 distro==1.3.0