diff --git a/requirements.txt b/requirements.txt
index 7ba3319241..2ec01b1916 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,3 +9,4 @@ django-rest-swagger==2.2.0
 coverage==4.5.2
 django-nose==1.4.6
 jsonnet==0.12.1
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability