diff --git a/docs/requirements.txt b/docs/requirements.txt
index 6e79848..ab0fd0e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -8,6 +8,8 @@ mkdocs-redirects
 mkdocs-enumerate-headings-plugin
 mkdocs-git-revision-date-localized-plugin
 # needed for the create-uuid.py helper script
+pymdown-extensions
 shortuuid
+cffi
 # Needed for mkdocstrings python documentation generator
 black