diff --git a/requirements.txt b/requirements.txt
index 84cc8551..cae2f41b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ requests==2.20.0
 urllib3==1.22
 SQLAlchemy==1.3.6
 SQLAlchemy-Utils==0.33.3
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability