diff --git a/requirements.txt b/requirements.txt
index e452071..d0ae3ba 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -84,7 +84,7 @@ six==1.13.0
 sympy==1.4
 terminado==0.8.3
 testpath==0.4.4
-tornado==6.3.2
+tornado==6.3.3
 traitlets==4.3.3
 urllib3==1.26.5
 wcwidth==0.1.7