diff --git a/requirements-dev.txt b/requirements-dev.txt
index ee12438..e4e6dd9 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -8,3 +8,4 @@ pytest-cov==2.12.1
 pytest-flake8==1.0.7
 pytest-random-order==1.0.4
 requests==2.25.1
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability