diff --git a/requirements.txt b/requirements.txt
index 2796df0..6e26e7f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ greenlet==0.4.17
 idna==2.10
 itsdangerous==1.1.0
 Jinja2==2.11.3
-lxml==4.6.2
+lxml>=4.6.3
 Mako==1.1.3
 MarkupSafe==1.1.1
 numerize==0.12