diff --git a/requirements.txt b/requirements.txt
index 09a1999..428f29b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -91,7 +91,7 @@ konlpy==0.4.4
 lazy-object-proxy==1.2.2
 llvmlite==0.21.0
 locket==0.2.0
-lxml==3.7.2
+lxml==4.9.1
 Markdown==2.6.11
 MarkupSafe==0.23
 matplotlib==2.2.2