diff --git a/docs/requirements.txt b/docs/requirements.txt
index ff66b42e3..1928f3e1c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,3 +3,4 @@ sphinx-issues
 # sphinx-notfound-page with change for Github Pages https://github.com/readthedocs/sphinx-notfound-page/pull/94
 git+https://github.com/gmelikov/sphinx-notfound-page.git@github_pages#egg=sphinx-notfound-page
 sphinx-rtd-theme
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability