diff --git a/requirements.txt b/requirements.txt
index 89c56bd..d50a78c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ ipaddress==1.0.23
 itsdangerous==1.1.0
 Jinja2==2.10.1
 jsonschema==3.2.0
-lxml==4.4.1
+lxml==4.9.1
 MarkupSafe==1.1.1
 pathlib2==2.3.5
 pycparser==2.19