diff --git a/requirements.txt b/requirements.txt
index 3cae8b6..899ffd1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ enum34==1.1.6
 funcsigs==1.0.2
 functools32==3.2.3.post2
 futures==3.2.0
-html5lib==0.9999999
+html5lib==0.999999999
 ipykernel==4.7.0
 ipython==5.5.0
 ipython-genutils==0.2.0