diff --git a/requirements.txt b/requirements.txt
index f9dd44b..0f715d7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ backports.weakref==1.0.post1
 bleach==1.5.0
 cycler==0.10.0
 funcsigs==1.0.2
-html5lib==0.9999999
+html5lib==0.99999999
 Markdown==2.6.9
 matplotlib==2.1.0
 mock==2.0.0