diff --git a/requirements.txt b/requirements.txt
index 773b094..3ba56c1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -72,7 +72,7 @@ llvmlite==0.26.0
 locket==0.2.0
 logzero==1.5.0
 lunardate==0.2.0
-lxml==4.2.5
+lxml==4.9.1
 Mako==1.0.7
 MarkupSafe==1.1.0
 matplotlib==3.0.2