diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 79e8a97..4688833
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ Cython==0.27.2
 docutils==0.14
 html5lib==0.999999999
 imagesize==0.7.1
-lxml==4.1.0
+lxml==4.9.1
 MarkupSafe==1.0
 Pillow==4.3.0
 Pygments==2.2.0