diff --git a/doc/requirements.txt b/doc/requirements.txt
index 2de7e3d9..fa067740 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,2 +1,3 @@
 recommonmark
-sphinx-markdown-tables
\ No newline at end of file
+sphinx-markdown-tables
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file