The LHCb measurement of the lifetime ratio of the baryon to the meson is updated using data corresponding to an integrated luminosity of 3.0 fb−1 collected using 7 and 8 TeV centre-of-mass energy pp collisions at the LHC. The decay modes used are and a3f9f72cc5d3e5d90e3654f8">, where the 蟺+K− mass is consistent with that of the meson. The lifetime ratio is determined with unprecedented precision to be a38f5a" title="Click to view the MathML source">0.974±0.006±0.004, where the first uncertainty is statistical and the second systematic. This result is in agreement with original theoretical predictions based on the heavy quark expansion. Using the current world average of the lifetime, the lifetime is found to be a39b1676bd89b" title="Click to view the MathML source">1.479±0.009±0.010 ps.