diff --git a/requirements.txt b/requirements.txt
index d19e293..55f72c7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -64,7 +64,7 @@ grpc-google-iam-v1==0.11.4
 grpcio==1.12.0
 h5py==2.8.0
 hmmlearn==0.2.0
-html5lib==0.9999999
+html5lib==0.999999999
 httplib2==0.10.3
 hyperlink==18.0.0
 idna==2.6