diff --git a/requirements.txt b/requirements.txt
index 3e7f314..6e0bd2c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,3 +9,4 @@ hca >= 6.3.0, <7
 psycopg2-binary==2.7.5
 dcplib >= 3.2.1, < 4
 PyGithub
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability