diff --git a/examples/requirements.txt b/examples/requirements.txt
index 24830b8a..3f8e9bf0 100644
--- a/examples/requirements.txt
+++ b/examples/requirements.txt
@@ -7,3 +7,4 @@ jupyter
 matplotlib
 Pillow
 tqdm
+tornado>=6.4.2 # not directly required, pinned by Snyk to avoid a vulnerability