Support for Fianna Fáil is up four points in the latest opinion poll.
The Red C survey for the Sunday Business Post shows the party had the support of 27% of respondents.
Fine Gael, despite a drop of two points, is still out in front on 34%.
Labour is unchanged at 17%, with the Greens staying on 5%.
Sinn Féin is down two points to 8%; Independents and others are unchanged at 9%.