diff --git a/requirements.txt b/requirements.txt
index d6afe91..941d548 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ gevent==1.0.1
 gevent-socketio==0.3.6
 gevent-websocket==0.9.3
 greenlet==0.4.5
-html5lib==0.999
+html5lib==0.999999999
 itsdangerous==0.24
 lockfile==0.10.2
 maildump==0.5.1