Livorno are back in Serie A after beating Empoli 1-0 in Sunday's promotion play-off to complete a 2-1 aggregate success.
Paulinho got the goal in the 32nd minute, finishing after Pasquale Schiattarella picked him out in the area.
Livorno were relegated from Serie A in 2010. They finished third in the Serie B regular season, one place above Empoli, and narrowly edged out Brescia in the play-off semi-finals.
They join Sassuolo and Hellas Verona in earning promotion.