diff --git a/requirements.txt b/requirements.txt
index b5a30d3..acb3d5d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,8 +21,8 @@ mkdocs-macros-plugin
 mkdocs-extra-sass-plugin
 mkdocs-rss-plugin
 mkdocs-with-pdf
+mkdocs-htmlproofer-plugin
 livereload
 qrcode
 pillow 
 cairosvg
-htmlproofer