diff --git a/requirements.txt b/requirements.txt
index dd2a67c..4bee647 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ gunicorn==19.7.1
 gym==0.10.4
 h5py==2.7.0
 heapdict==1.0.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 ijson==2.3
 imageio==2.2.0