diff --git a/requirements.txt b/requirements.txt
index 25cedae..5c2d72e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ bleach==1.5.0
 cycler==0.10.0
 gast==0.2.0
 grpcio==1.11.0
-html5lib==0.9999999
+html5lib==0.999999999
 Markdown==2.6.11
 matplotlib==2.1.0
 numpy==1.14.2