diff --git a/requirements.txt b/requirements.txt
index 2db6a23..e67891e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ gunicorn==19.7.1
 html5lib==0.999
 idna==2.6
 itsdangerous==0.24
-lxml==4.1.1
+lxml==4.6.3
 nltk==3.2.5
 nose==1.3.1
 numpy==1.8.2