diff --git a/requirements.txt b/requirements.txt
index 2c939d49b..bbe04ffbd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,3 +11,4 @@ regex==2017.4.5
 requests>=2.13.0,<3.0.0
 mock>=2.0.0,<3.0.0
 pathlib==1.0.1; python_version < "3.4"
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability