diff --git a/requirements.txt b/requirements.txt
index 7d1849f..59211be 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ isort==4.3.4
 itsdangerous==0.24
 Jinja2>=2.10.1
 lazy-object-proxy==1.3.1
-lxml==4.2.1
+lxml==4.9.1
 MarkupSafe==1.0
 mccabe==0.6.1
 numpy==1.16.0