diff --git a/requirements.txt b/requirements.txt
index bf7ac72..77111c7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ cycler==0.10.0
 enum34==1.1.6
 future==0.16.0
 gym==0.9.4
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 Markdown==2.6.11
 matplotlib==2.1.1