diff --git a/requirements.txt b/requirements.txt
index bbb34a05544651167bdad77ebc21027516627d86..ce1309b5c9fbd5aa54a6f2d9ec0f0c133385fcb7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,3 +17,4 @@ flake8
 coverage
 pyaml
 sphinx
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability