diff --git a/requirements.txt b/requirements.txt
index f355fe5..ae5b237 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ cryptography==2.0.3
 defusedxml==0.5.0
 idna==2.5
 isodate==0.5.4
-lxml==3.8.0
+lxml==4.6.2
 pycparser==2.18
 pyOpenSSL==17.5.0
 pytz==2017.2