diff --git a/ChineseSegmentation/requirements.txt b/ChineseSegmentation/requirements.txt
index a3c8279..97f5d3e 100644
--- a/ChineseSegmentation/requirements.txt
+++ b/ChineseSegmentation/requirements.txt
@@ -33,7 +33,7 @@ jupyter-client==5.1.0
 jupyter-console==5.1.0
 jupyter-core==4.3.0
 Keras==2.0.5
-lxml==3.8.0
+lxml==4.6.5
 Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==2.0.0