diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 78d499f..f0f3b11
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ image==1.5.5
 ipaddress==1.0.18
 itsdangerous==0.24
 Jinja2==2.9.5
-lxml==3.7.3
+lxml==4.9.1
 MarkupSafe==1.0
 matplotlib==2.0.0
 MySQL-python==1.2.5