Unused output pin of Shift Register 74HC595

I will be using the 6 output pin of Shift Register 74HC595.

The other 2 output pin are unused, what should I do to them, connect it to ground ?

mikechale:
The other 2 output pin are unused, what should I do to them, connect it to ground ?

Never connect output pins to ground, Vcc or any fixed voltage line.

In fact that's the only thing to do with unused outputs, do not connect to anything.