diff --git a/requirements.txt b/requirements.txt
index 650d5089b..ece857e80 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,5 +36,7 @@ MarkupSafe==2.0.1
 # TODO: needed by some plugins: migrate
 simple_logger
 matplotlib
+tornado>=6.3.3 # not directly required, pinned by Snyk to avoid a vulnerability
 validators==0.20.0
-pillow>=10.0.1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file
+pillow>=10.0.1 # not directly required, pinned by Snyk to avoid a vulnerability
+