diff --git a/requirements.txt b/requirements.txt
index eec1438..348a54c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 asteval==0.9.13
 cycler==0.10.0
 kiwisolver==1.0.1
-lxml==4.6.3
+lxml==4.6.5
 matplotlib==2.2.3
 mpmath==1.0.0
 numpy==1.15.3