diff --git a/requirements.txt b/requirements.txt
index ad29379..27f5812 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,5 @@ matplotlib==2.1.1
 scikit-learn==0.19.1
 scipy==0.19.1
 seaborn==0.8.0
-lxml==4.2.5
+lxml==4.9.1
 statsmodels==0.9.0