diff --git a/requirements.txt b/requirements.txt
index 5a207d0..2d9233e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ defusedxml==0.5.0
 entrypoints==0.3
 gast==0.2.2
 grpcio==1.19.0
-html5lib==0.9999999
+html5lib==0.99999999
 ipykernel==5.1.0
 ipython==7.3.0
 ipython-genutils==0.2.0