diff --git a/requirements.txt b/requirements.txt
index 5fd31bb..fe66ddd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -86,7 +86,7 @@ jupyter-core==4.4.0
 kafka-python==1.4.6
 kiwisolver==1.0.1
 locket==0.2.0
-lxml==4.0.0
+lxml==4.9.1
 Markdown==3.0.1
 MarkupSafe==1.0
 matplotlib==3.0.1