diff --git a/requirements.txt b/requirements.txt
index 7af8fc5..8712760 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 Flask_RESTful==0.3.6
 dicttoxml==1.7.4
 Flask_JWT==0.3.2
-lxml==3.7.3
+lxml==4.6.5
 xmltodict==0.10.2
 pony==0.7.2
 Flask_Cors==3.0.3