diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 3b2adbe..3429877
--- a/requirements.txt
+++ b/requirements.txt
@@ -46,7 +46,7 @@ kazoo==2.4.0
 kiwisolver==1.0.1
 kombu==4.2.1
 lazy-object-proxy==1.3.1
-lxml==4.2.1
+lxml==4.6.5
 Markdown==2.6
 MarkupSafe==1.0
 matplotlib==2.2.2