diff --git a/requirements.txt b/requirements.txt
index 7b19062..b9930c1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ humanfriendly==1.44.7
 idna==2.8
 Jinja2==2.10.1
 jinja2-django-tags==0.5
-lxml==3.5.0
+lxml==4.9.1
 markovify==0.2.5
 MarkupSafe==0.23
 pipdeptree==0.13.1