diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index be088ce..2ffbe58
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-lxml==4.6.1
+lxml==4.9.1
 requests==2.24.0
 xylose==1.35.4