diff --git a/requirements.txt b/requirements.txt
index 5bb443f..647ddac 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ cryptography==0.9.3
 enum34==1.0.4
 funcsigs==0.4
 futures==3.0.3
-html5lib==0.999999
+html5lib==0.999999999
 idna==2.0
 ipaddress==1.0.12
 isodate==0.5.1