diff --git a/requirements.txt b/requirements.txt
index d612b79..f1c39da 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ gast==0.2.0
 gitdb2==2.0.3
 GitPython==2.1.8
 grpcio==1.10.0
-html5lib==0.9999999
+html5lib==0.999999999
 httplib2==0.18.0
 idna==2.6
 ipykernel==4.8.2