Upgrade to marshmallow?

I have moto x with android version 5.1. Is it possible to upgrade to Marshmallow?

Republic legacy phones (Moto X 1&2, Moto E 1&2, Moto G 1&3) will not be seeing any further OS updates

for all but the Moto G 3rd this is due to a Motorola deciding that they are at end of life (no carrier version of the Moto X 2 got the update to marshmallow) for the Moto G 3rd it was Republic deciding that upgrade 1 phone for old plans was not worth the cost

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