diff --git a/requirements.txt b/requirements.txt
index 0c035f9..888fa52 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ docutils==0.14
 gast==0.2.0
 gensim==3.4.0
 grpcio==1.10.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 jmespath==0.9.3
 Markdown==2.6.11