diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 55438bd..01c12dc
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ joblib==0.13.2
 Keras==2.2.4
 Keras-Applications==1.0.7
 Keras-Preprocessing==1.0.9
-lxml==4.3.3
+lxml==4.9.1
 Markdown==3.1.1
 MarkupSafe==1.1.1
 mock==3.0.5