diff --git a/requirements.txt b/requirements.txt
index 863f22a..4dcebaa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 jupyter
-tornado==4.5.3
+tornado==6.3.3
 notebook==5.7.8
 bash_kernel
 jupyter-c-kernel