diff --git a/requirements.txt b/requirements.txt
index 5ed2e28..d4514cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ gunicorn==19.4.5
 html5lib==0.999
 httplib2==0.8
 itsdangerous==0.24
-lxml==3.3.3
+lxml==4.6.5
 oauthlib==0.6.1
 piston-mini-client==0.7.5
 plainbox==0.5.3