diff --git a/requirements.txt b/requirements.txt
index 6787a40..7f77ef0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ docutils==0.14
 entrypoints==0.2.3
 enum34==1.1.6
 h5py==2.7.1
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 imagesize==0.7.1
 ipykernel==4.6.1