N.Y. EPT Law § 3-4.6

§ 3-4.6 Revocation or alteration of later will not to revive prior will\n or any provisions thereof\n (a) If after executing a will the testator executes a later will which\nrevokes or alters the prior one, a revocation of the later will does\nnot, of itself, revive the prior will or any provision thereof.\n (b) A revival of a prior will or of one or more of its provisions may\nbe effected by:\n (1) The execution of a codicil which in terms incorporates by\nreference such prior will or one or more of its provisions.\n (2) A writing declaring the revival of such prior will or of one or\nmore of its provisions, which is executed and attested in accordance\nwith the formalities prescribed by this article for the execution and\nattestation of a will.\n (3) A republication of such prior will, whether to the original\nwitnesses or to new witnesses, which shall require a re-execution and\nre-attestation of the prior will in accordance with the formalities\nprescribed by 3-2.1.\n