diff --git a/requirements.txt b/requirements.txt
index 34fb678..fc9caaf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ docutils==0.14
 feedgenerator==1.9
 ghp-import==0.5.5
 Jinja2==2.10.1
-lxml==4.3.3
+lxml==4.9.1
 Markdown==3.1
 MarkupSafe==1.1.1
 pelican==4.0.1