diff --git a/PythonAnalysis/pydata-book/requirements.txt b/PythonAnalysis/pydata-book/requirements.txt
index 0aebcf68..e8b49fe2 100644
--- a/PythonAnalysis/pydata-book/requirements.txt
+++ b/PythonAnalysis/pydata-book/requirements.txt
@@ -1,7 +1,7 @@
 numpy==1.13.3
 pandas==0.21.0
 matplotlib==2.1.0
-lxml==4.1.0
+lxml==4.9.1
 seaborn==0.8.1
 statsmodels==0.8.0
 scipy==1.0.0