diff --git a/requirements.txt b/requirements.txt
index 8bff781..8fbf0bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ idna==2.5
 itsdangerous==0.24
 Jinja2==2.9.6
 jmespath==0.9.2
-lxml==3.5.0
+lxml==4.9.1
 MarkupSafe==1.0
 oauth2client==3.0.0
 packaging==16.8