diff --git a/requirements.txt b/requirements.txt
index 9d80603..8fbbe20 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ enum34==1.1.6
 ftfy==4.4.3
 funcsigs==1.0.2
 functools32==3.2.3.post2
-html5lib==0.9999999
+html5lib==0.999999999
 ipykernel==4.6.1
 ipython==5.3.0
 ipython-genutils==0.2.0