diff --git a/requirements.txt b/requirements.txt
index 8c15c2e..93f24cf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ isodate==0.6.0
 itsdangerous==1.1.0
 Jinja2==2.11.1
 jwcrypto==0.7
-lxml==4.5.0
+lxml==4.9.1
 MarkupSafe==1.1.1
 pycparser==2.20
 python-dateutil==2.8.1