diff --git a/requirements.txt b/requirements.txt
index 51c8c4c..5a41f68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 chalice==1.5.0
 dcplib
 requests
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability