diff --git a/requirements.txt b/requirements.txt
index ece7b3b..531c077 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ importlib-metadata==4.5.0
 isodate==0.6.0
 itsdangerous==2.0.1
 Jinja2==3.0.1
-lxml==4.6.3
+lxml==4.9.1
 MarkupSafe==2.0.1
 msgpack==1.0.2
 pycparser==2.20