diff --git a/requirements.txt b/requirements.txt
index 007c5c7..71f4e72 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ idna==2.8
 imagesize==1.1.0
 isodate==0.6.0
 Jinja2==2.10.1
-lxml==4.3.3
+lxml==4.9.1
 MarkupSafe==1.1.1
 more-itertools==7.0.0
 packaging==19.0