Composer error pri instalacii package-ov do projektu

Caute. Snazim sa rozbeznut 1 z tychto 2 balickov vo svojom projekte, nakolko sa snazim spravit real-time aplikaciu.
https://github.com/Grez/websockets
https://github.com/…ty22/ratchet

Dostavam vsak z composeru error:

[InvalidArgumentException]
Could not find package teddy/websockets at any version for your minimum-stability (stable). Check the package spelling or your minimum-stability

Pouzivam najnovsiu verziu Nette. Z composer.json:

		"php": ">= 5.3.7",
		"nette/application": "~2.3.6",
		"nette/bootstrap": "~2.3.0",
		"nette/caching": "~2.3.0",
		"nette/database": "~2.3.0",
		"nette/di": "~2.3.0",
		"nette/finder": "~2.3.0",
		"nette/forms": "~2.3.0",
		"nette/http": "~2.3.0",
		"nette/mail": "~2.3.0",
		"nette/robot-loader": "~2.3.0",
		"nette/safe-stream": "~2.3.0",
		"nette/security": "~2.3.0",
		"nette/utils": "~2.3.0",
		"latte/latte": "~2.3.0",
		"tracy/tracy": "~2.3.0"

Ten prvy balicek pritom vyzera byt celkom aktualny, takze by ma zaujimalo, preco dostavam tu chybu. Je nejaky sposob ako composer prinutit nainstalovat tieto balicky do projektu? Dakujem.