Do I still need to use Xfinity's equipment for faster upload speeds?

I noticed on my account page that for my current internet plan (Gigabit), it shows the speeds listed as up to 1000 Down and 100 up.  Do I still need to use Xfinity's equipment to achieve the faster upload?  I'm currently only getting 20-22 Mbps for my upload, which I believe is the old speed for the Gigabit plan.   I called Xfinity and they said my current equipment does indeed support the faster upload speeds and to reboot my equipment.  Unfortunately even after a reboot the speed didn't change.

I can get close to the 1000 down no problem, but it'd be nice to get that faster upload speed.

My current equipment:

NetGear CM2000 Cable Modem

-Rum