diff --git a/docs/requirements.txt b/docs/requirements.txt
index 17b0cd8..975e1b6 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,3 @@
 mkdocs-material
 mkdocs-include-dir-to-nav
+urllib3>=2.6.3 # not directly required, pinned by Snyk to avoid a vulnerability