diff --git a/requirements.txt b/requirements.txt
index 488229e..92728b3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ appdirs==1.4.1
 click==7.0
 Flask==1.0
 jupyter==1.0.0
-lxml==4.6.2
+lxml==4.9.1
 matplotlib==3.1.1
 pandas==0.25.2
 gunicorn==19.6.0