diff --git a/requirements.txt b/requirements.txt
index 38f7c74..d0b0bc8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ jupyter-client==6.1.3
 jupyter-console==6.1.0
 jupyter-core==4.6.3
 konlpy==0.5.2
-lxml==4.5.1
+lxml==4.9.1
 Markdown==3.2.2
 MarkupSafe==1.1.1
 mecab-python @ file:///tmp/mecab-python-0.996