diff --git a/test-requirements.txt b/test-requirements.txt
index cb07b76..1d36666 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,3 +7,4 @@ fixtures
 mock
 sphinx
 sphinx_rtd_theme
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability