diff --git a/requirements.txt b/requirements.txt
index 2edb26c..27fd3cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,5 +11,5 @@ python-dateutil==2.8.1
 scipy==1.6.3
 six==1.15.0
 sympy==1.8
-tornado==6.1
+tornado==6.3.1
 sphinxcontrib-bibtex