diff --git a/docs/requirements.txt b/docs/requirements.txt
index 81f9ddf00..9e6750ae5 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,3 +4,4 @@ sphinx >= 2.0
 sphinx_markdown_tables
 sphinx_rtd_theme
 sphinxcontrib-mermaid
+urllib3>=2.6.3 # not directly required, pinned by Snyk to avoid a vulnerability