diff --git a/requirements.txt b/requirements.txt
index af1bb32..007163d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ gunicorn==19.9.0
 idna==2.8
 itsdangerous==1.1.0
 Jinja2==2.10.1
-lxml==4.3.3
+lxml==4.9.1
 MarkupSafe==1.1.1
 pytz==2019.1
 requests==2.22.0