diff --git a/requirements.txt b/requirements.txt
index 08fdb87..2e43280 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ gunicorn==19.9.0
 idna==2.7
 -e git://github.com/EdjoLabs/image-match.git#egg=image-match
 kiwisolver==1.0.1
-lxml==4.6.3
+lxml==4.9.1
 Markdown==2.6.11
 matplotlib==2.2.2
 networkx==2.1