diff --git a/requirements.txt b/requirements.txt
index d25d57f..d5fd15c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ certifi==2017.11.5
 chardet==3.0.4
 future==0.16.0
 gym==0.9.4
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 Markdown==2.6.9
 numpy==1.13.3