diff --git a/requirements.txt b/requirements.txt
index 4a9e953..e3a18e0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ typing
 pex
 tox
 pycodestyle
+urllib3>=2.6.3 # not directly required, pinned by Snyk to avoid a vulnerability