diff --git a/requirements.txt b/requirements.txt
index 2b1f6eb..f573ca3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ enum34==1.1.6
 funcsigs==1.0.2
 future==0.16.0
 futures==3.2.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 Markdown==2.6.11
 matplotlib==2.1.2