diff --git a/requirements-docs.txt b/requirements-docs.txt
index 0a0442dc6030..18b2e2397a8d 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -14,3 +14,4 @@ pygments<=2.14.0 # via sphinx
 pytz<=2022.7 # via babel
 snowballstemmer<=2.2.0 # via sphinx
 sphinx-rtd-theme<=0.5.2 # via sphinx
+certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability