diff --git a/requirements.txt b/requirements.txt
index a80b5c0..e7a055f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ ipython-genutils==0.2.0
 isort==4.2.15
 jedi==0.11.0
 lazy-object-proxy==1.3.1
-lxml==4.0.0
+lxml==4.9.1
 mccabe==0.6.1
 numexpr==2.6.4
 numpy==1.13.1