diff --git a/doc/requirements.txt b/doc/requirements.txt
index ff8238184df..25dad641763 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -36,3 +36,4 @@ nbconvert==5.6.1
 orjson
 dash-bio
 jinja2<3.1
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability