diff --git a/chalice/requirements.txt b/chalice/requirements.txt
index d6b8dba5..66de47f9 100644
--- a/chalice/requirements.txt
+++ b/chalice/requirements.txt
@@ -12,3 +12,4 @@ tenacity==5.0.2
 psycopg2==2.7.5
 pandas==0.23.4
 s3fs==0.1.6
+urllib3>=1.26.19 # not directly required, pinned by Snyk to avoid a vulnerability