diff --git a/Doc/requirements.txt b/Doc/requirements.txt
index 198446b350ff2d..7e5191e245d61e 100644
--- a/Doc/requirements.txt
+++ b/Doc/requirements.txt
@@ -1,5 +1,6 @@
 # Requirements for docs build on netlify
 # Pin sphinx to version specified in .travis.yml
-sphinx==2.2.0
+sphinx==3.0.4
 blurb
 python-docs-theme
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability