diff --git a/requirements.txt b/requirements.txt
index 692d422..2b530e7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ docutils==0.12
 FormEncode==1.3.0
 Jinja2==2.10.1
 lazy-object-proxy==1.2.1
-lxml==4.6.2
+lxml==4.9.1
 MarkupSafe==0.23
 pbr==1.8.1
 py==1.4.31