diff --git a/docs/requirements.txt b/docs/requirements.txt
index 6a88d52..581bd8c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,3 +4,4 @@ pydata-sphinx-theme
 numpydoc
 psycopg2
 rdflib
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability