diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index df82c2f..06bb5d1
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ jupyterlab==0.31.12
 jupyterlab-launcher==0.10.5
 Keras==2.1.6
 kiwisolver==1.0.1
-lxml==4.2.3
+lxml==4.9.1
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.2.2