diff --git a/requirements.txt b/requirements.txt
index ca035a5..1c9c15b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ defer==1.0.6
 devscripts===2.16.2ubuntu3
 docutils==0.13.1
 esptool==1.3
-html5lib==0.999
+html5lib==0.99999999
 imagesize==0.7.1
 Jinja2==2.9.5
 jsonschema==2.6.0