diff --git a/requirements.txt b/requirements.txt
index f3ef2c1..325e8bc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ jdcal==1.4.1
 Jinja2==2.11.2
 json5==0.9.4
 lazy-object-proxy==1.4.3
-lxml==4.5.0
+lxml==4.6.5
 MarkupSafe==1.1.1
 mccabe==0.6.1
 numpy==1.13.1