Abstract Escape of the trapped neutrinos from a protoneutron star might cause a phase transition from a core nucleonic neutron star to a core hyperonic neutron star, which leads to the softening of the equation of state. We study the effects of the phase transition on the rotational evolution of a protoneutron star. It is found that the star keeps shrinking and spinning up until all the trapped neutrinos escape. If the hyperonic star is metastable, its rotational frequency accelerates distinguishedly before it collapses to a black hole.
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