diff --git a/requirements.txt b/requirements.txt
index f308d6d9..e7ab20e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ gast==0.2.0
 graphviz==0.8.2
 grpcio==1.10.0
 h5py==2.7.1
-html5lib==0.9999999
+html5lib==0.999999999
 ipykernel==4.8.2
 ipython==6.2.1
 ipython-genutils==0.2.0