diff --git a/requirements.txt b/requirements.txt
index 8654e90..42af6a7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ jProcessing==0.1
 jsbeautifier==1.11.0
 kiwisolver==1.2.0
 lockfile==0.12.2
-lxml==4.5.1
+lxml==4.9.1
 mecab-python3==0.996.5
 msgpack==0.6.2
 neologdn==0.4