diff --git a/doc/requirements-docs.txt b/doc/requirements-docs.txt
index 997bc0f..3294e24 100644
--- a/doc/requirements-docs.txt
+++ b/doc/requirements-docs.txt
@@ -6,3 +6,8 @@ sphinx-intl
 sphinx-markdown-tables
 sphinx-notfound-page
 sphinx_rtd_theme
+tornado>=6.3.2 # not directly required, pinned by Snyk to avoid a vulnerability
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
+urllib3>=1.26.19 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.32.2 # not directly required, pinned by Snyk to avoid a vulnerability