diff --git a/etl/requirements-dev.txt b/etl/requirements-dev.txt
index a0037e1..49af8e3 100644
--- a/etl/requirements-dev.txt
+++ b/etl/requirements-dev.txt
@@ -7,3 +7,4 @@ csvs-to-sqlite==1.3
 ipython>=8.10.0 # not directly required, pinned by Snyk to avoid a vulnerability
 numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
+tornado>=6.3.3 # not directly required, pinned by Snyk to avoid a vulnerability