diff --git a/requirements.txt b/requirements.txt
index 595d906..4649470 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ ipython-genutils==0.2.0
 iso8601==0.1.12
 jedi==0.16.0
 joblib==0.16.0
-lxml==4.5.0
+lxml==4.9.1
 multidict==4.7.5
 nltk==3.5
 numpy==1.19.1