diff --git a/requirements.txt b/requirements.txt
index cad7640..d72e05f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -62,7 +62,7 @@ tables==3.4.3
 tempora==1.11
 terminado==0.8.1
 testpath==0.3.1
-tornado==5.0.2
+tornado==6.3.3
 traitlets==4.3.2
 urllib3>=1.23
 wcwidth==0.1.7