diff --git a/requirements.txt b/requirements.txt
index 25952d1..34bb6f8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -163,3 +163,4 @@ Werkzeug==0.15.3
 #wrapt==1.9.0
 xmltodict==0.10.2
 
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability