diff --git a/requirements.txt b/requirements.txt
index afca336..d09d6d3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ google-pasta==0.1.4
 html5lib==1.0.1
 ipython==5.8.0
 ipython-genutils==0.2.0
-lxml==4.2.5
+lxml==4.6.3
 nose2==0.9.1
 numpy==1.15.1
 opencv-contrib-python==4.1.0.25