diff --git a/requirements.txt b/requirements.txt
index e0d0495..8edd4c8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 cycler==0.10.0
 kiwisolver==1.0.1
 leopard==0.1.4
-lxml==4.2.1
+lxml==6.1.0
 matplotlib==2.2.2
 numpy==1.14.2
 ordered-set==2.0.2