diff --git a/docs/requirements.txt b/docs/requirements.txt
index 67342ba7..b39fe6f9 100755
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -8,4 +8,5 @@ ipykernel==6.4.1
 #insipid_sphinx_theme==0.2.1
 pydata-sphinx-theme==0.11.0
 Jinja2==3.1.2
-markupsafe==2.1.1
\ No newline at end of file
+markupsafe==2.1.1
+lxml-html-clean==0.1.1
\ No newline at end of file