Two-dimensional layered crystals could show phonon properties that are markedly distinct from those of their bulk counterparts, because of the loss of periodicities along the c-axis directions. Here we investigate the phonon properties of bulk and atomically thin α-MoTe₂ using Raman spectroscopy. The Raman spectrum of α-MoTe₂ shows a prominent peak of the in-plane E¹_2g mode, with its frequency upshifting with decreasing thickness down to the atomic scale, similar to other dichalcogenides. Furthermore, we find large enhancement of the Raman scattering from the out-of-plane B¹_2g mode in the atomically thin layers. The B¹_2g mode is Raman inactive in the bulk, but is observed to become active in the few-layer films. The intensity ratio of the B¹_2g to E¹_2g peaks evolves significantly with decreasing thickness, in contrast with other dichalcogenides. Our observations point to strong effects of dimensionality on the phonon properties of MoTe₂.