diff --git a/requirements.txt b/requirements.txt
index c643c13..6f355c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ GitPython==3.1.24
 invoke==1.6.0
 Jinja2==3.0.2
 livereload==2.6.3
-lxml==4.6.3
+lxml==4.9.1
 Markdown==3.3.4
 MarkupSafe==2.0.1
 mypy-extensions==0.4.3