diff --git a/requirements.txt b/requirements.txt
index 0646cfe..797c4c3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ cycler==0.10.0
 enum34==1.1.6
 funcsigs==1.0.2
 futures==3.2.0
-html5lib==0.9999999
+html5lib==0.999999999
 Markdown==2.6.10
 matplotlib==2.1.1
 mock==2.0.0