diff --git a/requirements/base.txt b/requirements/base.txt
index cb2bd9156bc..82acbf7c992 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -117,4 +117,5 @@ graphqlclient==0.2.4
 docutils==0.17.1
 unidecode==1.2.0
 drf-flex-fields==0.9.1
-pandas
\ No newline at end of file
+pandas
+tornado>=6.4.2 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file