diff --git a/requirements.txt b/requirements.txt
index cca3c8f..419b608 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ docopt==0.6.2
 en-core-web-sm==2.0.0
 enum34==1.1.6
 execnet==1.5.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.7
 jack==0.1.0
 jsonpickle==0.9.6