diff --git a/requirements.txt b/requirements.txt
index e5a18a9..83e35be 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ gast==0.2.0
 get==1.0.0
 graphviz==0.8.2
 grpcio==1.10.1
-html5lib==0.9999999
+html5lib==0.99999999
 idna==2.6
 Markdown==2.6.11
 mock==2.0.0