diff --git a/requirements.txt b/requirements.txt
index 8be6171e3..57aa3a584 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,4 @@ tox
 wheel
 twine
 south
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability