diff --git a/requirements.txt b/requirements.txt
index 6444dd4..7d6df81 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ Flask==1.0.2
 gunicorn==19.9.0
 itsdangerous==1.1.0
 Jinja2>=2.10.1
-lxml==4.3.0
+lxml==4.9.1
 MarkupSafe==1.1.0
 numpy==1.16.1
 pandas==0.24.0