diff --git a/requirements.txt b/requirements.txt
index 3a76331..058f46f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Pygments==2.1.3
 argparse==1.2.1
 chardet==2.0.1
 colorama==0.2.5
-html5lib==0.999
+html5lib==0.999999999
 mistune==0.7.3
 requests==2.2.1
 six==1.5.2