diff --git a/requirements.txt b/requirements.txt
index f311b53..7e96fb2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -214,7 +214,7 @@ spyder==4.0.1
 spyder-kernels==1.8.1
 terminado==0.8.3
 testpath==0.4.4
-tornado==6.0.3
+tornado==6.4.1
 traitlets==4.3.3
 ujson==5.4.0
 urllib3==1.26.5