diff --git a/requirements.txt b/requirements.txt
index e8f7e05..5a34ba9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ future==0.17.1
 idna==2.8
 itsdangerous==0.24
 Jinja2==2.10.1
-lxml==4.3.3
+lxml==4.9.1
 MarkupSafe==1.0
 pep8==1.7.1
 pkg-resources==0.0.0