diff --git a/requirements.txt b/requirements.txt
index 3db33de..4e0220b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 future==0.16.0
-lxml==3.7.0
+lxml==4.3.3
 retrying>=1.3.3
 zeep==0.23.0