diff --git a/requirements.txt b/requirements.txt
index 2374237..dccad23 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ matplotlib==3.5.1
 numpy==1.21.6
 pandas==1.3.5
 nibabel==3.2.2 
+lxml_html_clean