diff --git a/requirements.txt b/requirements.txt
index a5d38c4..d9534aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,7 +53,7 @@ kiwisolver==1.0.1
 lazy-object-proxy==1.4.1
 lockfile==0.12.2
 luigi==2.8.7
-lxml==4.4.0
+lxml==4.9.1
 Mako==1.0.14
 Markdown==2.6.11
 MarkupSafe==1.1.1