diff --git a/Pipfile b/Pipfile
index b122e3e..0b8be7e 100644
--- a/Pipfile
+++ b/Pipfile
@@ -128,7 +128,7 @@ testpath = "==0.5.0"
 thriftpy2 = "==0.4.14"
 toml = "==0.10.2"
 toolz = "==0.11.2"
-tornado = "==6.1"
+tornado = "==6.3.3"
 traitlets = "==5.1.1"
 typing-extensions = "==4.0.1"
 tzdata = "==2021.5"