diff --git a/requirements.txt b/requirements.txt
index 61c8527..21a8021 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,7 +31,7 @@ idna==2.6
 itsdangerous==0.24
 Jinja2==2.10
 jmespath==0.9.3
-lxml==4.2.5
+lxml==4.6.5
 Mako==1.0.7
 MarkupSafe==1.0
 matplotlib==2.1.2