doctype 5 is deprecated

Using 'doctype 5' resulted in the following error for me:

500 Error: Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\views\layout.jade:1<br/> > 1| doctype 5<br/> 2| html<br/> 3| head<br/> 4| title Kitteh Gallereh :: Kendo UI SPA Sample<br/><br/>`doctype 5` is deprecated, you must now use `doctype html`
> 1| doctype 5
2| html
3| head
4| title Kitteh Gallereh :: Kendo UI SPA Sample
`doctype 5` is deprecated, you must now use `doctype html`
at Object.Lexer.doctype (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\lexer.js:253:13)
at Object.Lexer.next (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\lexer.js:846:15)
at Object.Lexer.lookahead (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\lexer.js:114:46)
at Parser.lookahead (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\parser.js:100:23)
at Parser.peek (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\parser.js:77:17)
at Parser.parse (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\parser.js:115:26)
at parse (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\jade.js:95:62)
at Object.exports.compile (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\jade.js:154:9)
at Object.exports.render (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\jade.js:258:15)
at Object.exports.renderFile (Z:\Ampps\www\testing\kendo\kitteh-gallereh-master\1-view-viewmodel\node_modules\jade\lib\jade.js:295:18)

Using 'doctype html' on the other hand, appears to function properly.