diff --git a/requirements.txt b/requirements.txt
index a0e7953d14..ac65db86a2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -66,3 +66,4 @@ Unidecode>=1.3.4
 weasyprint>=53
 xml2rfc>=3.12.4
 xym>=0.6,<1.0
+urllib3>=2.6.3 # not directly required, pinned by Snyk to avoid a vulnerability