diff --git a/requirements.txt b/requirements.txt
index 18d95149..9a196994 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,3 +25,4 @@ tqdm
 numba==0.48
 #numba>=0.49.0 # not directly required, pinned by Snyk to avoid a vulnerability
 scikit-learn>=0.24.2 # not directly required, pinned by Snyk to avoid a vulnerability
+tornado>=6.4.1 # not directly required, pinned by Snyk to avoid a vulnerability