diff --git a/lambda/requirements.txt b/lambda/requirements.txt
index 986a1ec..26a0d8f 100644
--- a/lambda/requirements.txt
+++ b/lambda/requirements.txt
@@ -1,2 +1,3 @@
 requests
-Jinja2
\ No newline at end of file
+Jinja2
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file