diff --git a/requirements.txt b/requirements.txt
index 830ca34..485a661 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ graphviz==0.8.3
 greenlet==0.4.13
 grpcio==1.12.0
 h5py==2.7.1
-html5lib==0.9999999
+html5lib==0.999999999
 humanfriendly==4.12.1
 hyperlink==18.0.0
 idna==2.6