diff --git a/requirements.freeze.txt b/requirements.freeze.txt
index 5d47873..18fc168 100644
--- a/requirements.freeze.txt
+++ b/requirements.freeze.txt
@@ -9,7 +9,7 @@ docutils==0.13.1
 doit==0.30.3
 geocoder==1.20.1
 Logbook==1.0.0
-lxml==3.7.3
+lxml==4.9.1
 Mako==1.0.6
 MarkupSafe==1.0
 micawber==0.3.3