diff --git a/requirements.txt b/requirements.txt
index 3c51a93..be1db0a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ decorator==4.1.2
 elasticsearch==5.4.0
 elasticsearch-dsl==5.3.0
 entrypoints==0.2.3
-html5lib==0.9999999
+html5lib==0.99999999
 ipykernel==4.6.1
 ipython==6.1.0
 ipython-genutils==0.2.0