diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 319f5a3..526e97f
--- a/requirements.txt
+++ b/requirements.txt
@@ -132,7 +132,7 @@ keras-tqdm==2.0.1
 kiwisolver==1.0.1
 lightgbm==2.2.2
 llvmlite==0.26.0
-lxml==4.4.1
+lxml==4.6.2
 lz4==2.2.1
 Markdown==3.0.1
 MarkupSafe==1.1.0