diff --git a/requirements.txt b/requirements.txt
index 87ba527..6e1fba6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ idna==2.8
 jedi==0.13.3
 Jinja2==2.11.1
 jsonschema==3.0.1
-lxml==4.3.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 mistune==0.8.4
 numpy==1.16.2