diff --git a/requirements.txt b/requirements.txt
index edaae5b..206fe14 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ ipython==7.16.3
 Jinja2==2.11.3
 kombu==3.0.34
 libtaxii==1.1.118
-lxml==4.6.5
+lxml==4.9.1
 Markdown==2.4.1
 MarkupSafe==1.1.1
 maxminddb==1.2.0