diff --git a/requirements.txt b/requirements.txt
index 914910f..a7ea324 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ Flask-HTTPAuth==3.2.3
 Flask-RESTful==0.3.6
 itsdangerous==0.24
 Jinja2==2.9.6
-lxml==4.1.0
+lxml==4.6.5
 MarkupSafe==1.0
 olefile==0.44
 Pillow==4.3.0