diff --git a/requirements.txt b/requirements.txt
index 94afd8d..6e75d2a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ google-pasta==0.1.7
 grpcio==1.22.0
 guacamole==0.9.2
 h5py==2.9.0
-html5lib==0.999
+html5lib==0.999999999
 httplib2==0.9.1
 idna==2.0
 ipykernel==5.1.1