diff --git a/requirements.txt b/requirements.txt
index 3cca9f6..4383fac 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ pdfminer>=20140328
 requests==2.20.0
 pillow
 rebrick
+urllib3>=1.26.5 # not directly required, pinned by Snyk to avoid a vulnerability