diff --git a/package/requirements.txt b/package/requirements.txt
index 59d997d..7e92667 100644
--- a/package/requirements.txt
+++ b/package/requirements.txt
@@ -21,7 +21,7 @@ jmespath==0.10.0
 joblib==0.15.1
 kiwisolver==1.2.0
 korean-lunar-calendar==0.2.1
-lxml==4.5.0
+lxml==4.9.1
 matplotlib==3.2.1
 multitasking==0.0.9
 numpy==1.18.4