diff --git a/Lesson01/activity_1/requirements.txt b/Lesson01/activity_1/requirements.txt
index c9eebbf..e9ca676 100644
--- a/Lesson01/activity_1/requirements.txt
+++ b/Lesson01/activity_1/requirements.txt
@@ -34,7 +34,7 @@ jupyter-console==5.2.0
 jupyter-core==4.4.0
 Keras==2.1.2
 lesscpy==0.13.0
-lxml==4.1.1
+lxml==4.6.3
 Markdown==2.6.10
 MarkupSafe==1.0
 matplotlib==2.1.0