diff --git a/requirements.txt b/requirements.txt
index 7e04389..fda6661 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ iso8601==0.1.12
 itsdangerous==1.1.0
 jinja2==2.10.1
 leancloud==2.1.12
-lxml==4.3.3
+lxml==4.9.1
 markupsafe==1.1.1
 njupt==0.2.3
 pillow==6.0.0