diff --git a/requirements.txt b/requirements.txt
index ea2a681..a86d301 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -218,7 +218,7 @@ testpath==0.5.0
 text-unidecode==1.3
 toml==0.10.2
 toolz==0.11.1
-tornado==6.1
+tornado==6.3.3
 tqdm==4.62.3
 traitlets==5.1.0
 trio==0.19.0