diff --git a/requirements.txt b/requirements.txt
index 2f8adb5..14114e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ Flask==0.12.2
 idna==2.6
 itsdangerous==0.24
 Jinja2==2.9.6
-lxml==4.1.1
+lxml==4.9.1
 MarkupSafe==1.0
 requests==2.18.4
 urllib3>=1.23