diff --git a/Lesson-4/activity_9/requirements.txt b/Lesson-4/activity_9/requirements.txt
index df528f0..00a09b2 100644
--- a/Lesson-4/activity_9/requirements.txt
+++ b/Lesson-4/activity_9/requirements.txt
@@ -12,7 +12,7 @@ Flask-Caching==1.3.3
 Flask-Cors==3.0.3
 Flask-Testing==0.7.1
 h5py==2.7.1
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 itsdangerous==0.24
 Jinja2==2.10