diff --git a/requirements.txt b/requirements.txt
index a29ad0c..3ec572f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ graphviz==0.8.4
 greenlet==0.4.15
 grpcio==1.21.1
 h5py==2.9.0
-html5lib==0.9999999
+html5lib==0.999999999
 humanfriendly==4.18
 hyperlink==19.0.0
 idna==2.8