diff --git a/requirements.txt b/requirements.txt
index 25b717a..9cf9ebd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 bleach==1.5.0
 enum34==1.1.6
-html5lib==0.9999999
+html5lib==0.999999999
 Markdown==2.6.11
 numpy==1.13.3
 pandas==0.19.0