diff --git a/requirements.txt b/requirements.txt
index 8bc8d9c..6cda3d6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ docutils==0.14
 enum34==1.1.6
 grpcio==1.7.0
 grpcio-tools==1.7.0
-html5lib==0.9999999
+html5lib==0.999999999
 jmespath==0.9.3
 Markdown==2.6.11
 numpy==1.14.0