diff --git a/requirements.txt b/requirements.txt
index 78ed6cd..7c4d1bf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,3 +18,4 @@ setuptools>=65.5.0
 validators>=0.22.0
 xlrd>=2.0.1
 xmltodict>=0.13.0
+dnspython>=2.6.0rc1 # not directly required, pinned by Snyk to avoid a vulnerability