diff --git a/requirements.txt b/requirements.txt
index b7b22ac..0bfd285 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -130,7 +130,7 @@ lightgbm==2.3.0
 llvmlite==0.32.0
 locket==0.2.0
 lunardate==0.2.0
-lxml==4.5.0
+lxml==4.9.1
 Mako==1.1.2
 Markdown==3.2.2
 MarkupSafe==1.1.1