diff --git a/scripts/submission-index/requirements.txt b/scripts/submission-index/requirements.txt
index 414ee02..dc80b73 100644
--- a/scripts/submission-index/requirements.txt
+++ b/scripts/submission-index/requirements.txt
@@ -1,2 +1,3 @@
 requests
 hca
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability