diff --git a/controller/requirements.txt b/controller/requirements.txt
index 21dd5ab9..59669d98 100644
--- a/controller/requirements.txt
+++ b/controller/requirements.txt
@@ -10,3 +10,4 @@ pytest-mock==3.10.0
 pymongo==4.3.3
 coverage==7.2.2
 requests==2.28.1
+dnspython>=2.6.0rc1 # not directly required, pinned by Snyk to avoid a vulnerability