diff --git a/requirements.txt b/requirements.txt
index 7e00b0c..4c2243c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 requests==2.20
 mock==2.0.0
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability