diff --git a/requirements.txt b/requirements.txt
index 7e00b0c..b067425 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 requests==2.20
 mock==2.0.0
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability