diff --git a/requirements.txt b/requirements.txt
index b5ee15c..72ae674 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ entrypoints==0.2.3
 enum34==1.1.6
 funcsigs==1.0.2
 functools32==3.2.3.post2
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.5
 ipykernel==4.6.1
 ipython==5.4.1