diff --git a/requirements.txt b/requirements.txt
index a315c23..8ddc180 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ entrypoints==0.3
 gast==0.2.2
 grpcio==1.21.1
 h5py==2.9.0
-html5lib==0.9999999
+html5lib==0.999999999
 ipykernel==5.1.1
 ipython==7.5.0
 ipython-genutils==0.2.0