diff --git a/python/pytt/requirements.txt b/python/pytt/requirements.txt
index 9cfbf05..e010a62 100644
--- a/python/pytt/requirements.txt
+++ b/python/pytt/requirements.txt
@@ -8,7 +8,7 @@ Flask-APScheduler==1.11.0
 idna==2.8
 itsdangerous==1.1.0
 Jinja2==2.10.1
-lxml==4.6.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 python-dateutil==2.8.0
 pytz==2019.2