diff --git a/Lesson-4/activity_9/requirements.txt b/Lesson-4/activity_9/requirements.txt
index df528f0..469613c 100644
--- a/Lesson-4/activity_9/requirements.txt
+++ b/Lesson-4/activity_9/requirements.txt
@@ -17,7 +17,7 @@ idna==2.6
 itsdangerous==0.24
 Jinja2==2.10
 Keras==2.1.2
-lxml==4.1.1
+lxml==4.9.1
 Markdown==2.6.10
 MarkupSafe==1.0
 nose==1.3.7