diff --git a/requirements.txt b/requirements.txt
index 4208e20..a5e2ff5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ honcho==0.6.6
 itsdangerous==0.24
 Jinja2==2.10
 kombu==3.0.37
-lxml==3.4.4
+lxml==4.9.1
 Mako==1.0.0
 MarkupSafe==1.0
 packaging==16.8