diff --git a/requirements.txt b/requirements.txt
index 54ac959..1f0de6f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ gast==0.2.0
 grpcio==1.12.1
 h5py==2.6.0
 hdijupyterutils==0.12.5
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 imagesize==1.0.0
 intel-openmp==2018.0.3