diff --git a/requirements.txt b/requirements.txt
index 6bebed6..595d01b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -54,7 +54,7 @@ gym==0.9.6
 h5py==2.7.1
 heapdict==1.0.0
 html2text==2018.1.9
-html5lib==0.9999999
+html5lib==0.99999999
 idna==2.6
 imageio==2.1.2
 ipykernel==4.9.0