diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index c4e4443..9a95c48
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ ipython==6.2.1
 ipython-genutils==0.2.0
 jedi==0.11.0
 kombu==3.0.37
-lxml==4.0.0
+lxml==4.6.5
 mysql-connector==2.1.4
 oauthlib==2.0.4
 olefile==0.44