diff --git a/install/requirements.txt b/install/requirements.txt
old mode 100755
new mode 100644
index 9d1df65..d4f029a
--- a/install/requirements.txt
+++ b/install/requirements.txt
@@ -6,7 +6,7 @@ Django==1.9.1
 enum34==1.1.5
 idna==2.1
 ipaddress==1.0.16
-lxml==3.6.0
+lxml==4.9.1
 MySQL-python==1.2.5
 pyasn1==0.1.9
 pyasn1-modules==0.0.8