diff --git a/requirements.txt b/requirements.txt
index 32678ef..e3228d1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ johnnydep==1.5
 jwcrypto==0.7
 kombu==4.6.8
 lazy-object-proxy==1.4.3
-lxml==4.5.1
+lxml==4.9.1
 Mako==1.1.2
 Markdown==3.2.2
 MarkupSafe==1.1.1