diff --git a/requirements.txt b/requirements.txt
index 0dd74cd..9d41ba2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ ipaddress==1.0.18
 itsdangerous==0.24
 jieba==0.39
 Jinja2==2.10
-lxml==4.1.1
+lxml==4.6.5
 Mako==1.0.7
 MarkupSafe==1.0
 networkx==2.0