diff --git a/requirements.txt b/requirements.txt
index 1a9ace7..1b45ddc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ importlib-metadata==1.6.1
 joblib==0.15.1
 jsonschema==3.2.0
 kiwisolver==1.2.0
-lxml==4.5.1
+lxml==4.9.1
 MarkupSafe==1.1.1
 nltk==3.5
 notebook==6.0.3