diff --git a/requirements.txt b/requirements.txt
index ebd6adb..4f1903f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ Pillow==8.2.0
 python-dateutil==2.8.1
 PyYAML==5.4.1
 six==1.5.2
-tornado==6.1
+tornado==6.3.3
 bokeh==2.0.0
 matplotlib==3.4.1
 pytest==6.2.3