diff --git a/requirements.txt b/requirements.txt
index fb886a4..fef8b22 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -59,7 +59,7 @@ soupsieve==2.3.1
 stack-data==0.2.0
 terminado==0.13.3
 testpath==0.6.0
-tornado==6.3.3
+tornado==6.4.1
 traitlets==5.1.1
 wcwidth==0.2.5
 webencodings==0.5.1