diff --git a/requirements.txt b/requirements.txt
index 362c831..6af6bc2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ Flask==1.0.2
 Flask-Caching==1.4.0
 Flask-Compress==1.4.0
 Flask-SeaSurf==0.2.2
-html5lib==0.999
+html5lib==0.99999999
 ipykernel==4.6.1
 ipython==7.16.3
 ipython-genutils==0.2.0