diff --git a/requirements.txt b/requirements.txt
index 4c9b820..e60c410 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ Jinja2==2.10.1
 jupyter-client==6.1.3
 jupyter-core==4.6.3
 kiwisolver==1.1.0
-lxml==4.5.0
+lxml==4.9.1
 MarkupSafe==1.1.1
 matplotlib==3.2.1
 nltk==3.4.5