Shamrock Rovers have picked up a first win over Bohemians in more than two years.
Graham Burke's first-half goal settled the game, as Rovers beat their Dublin rivals 1-0.
A Tallaght Stadium league-record crowd of 7,020 were on hand for the game.
Dundalk remain four-points clear at the top of the table.
Dan Cleary scored twice in a 5-0 win away to UCD.
Neale Fenn's off to a losing start as Cork City manager, with Sligo Rovers running out 4-2 winners at Turner's Cross.
While Waterford and Derry drew 1-1 at the RSC.