diff --git a/requirements.txt b/requirements.txt
index 5870052..13de335 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ ipython-genutils==0.2.0
 jedi==0.12.1
 jupyter-client==5.2.3
 jupyter-core==4.4.0
-lxml==4.2.3
+lxml==4.9.1
 nltk==3.3
 numpy==1.14.5
 pandas==0.23.1