Caley Thistle suffered their third defeat in a row as they lost 2-1 to Dundee at Dens Park.
The win for the Dark Blues help them move off the bottom of the Scottish Premiership and above Inverness.
Caley Thistle manager Richie Foran made two changes from the side which lost to Aberdeen a week ago with Greg Tansey returning from suspension in place of Larnell Cole, who dropped to the bench. Lewis Horner also returned to the starting 11 in place of Brad McKay, who missed out due to injury.
Inverness made all the early running but could not find a way past a resolute Dundee defence and they were duly punished for not making more of their early pressure as the hosts opened the scoring in the 25th minute.
Craig Wighton was the scorer, making the most of no Inverness player closing him down on the edge of the box as he strode forward before beating Owain Fon Williams with a low drive.
Inverness responded strongly by dominating the remainder of the first half but they were unable to turn their pressure into an equaliser. Lonsana Doumbouya’s header straight at Scott Bain was the visitors’ only attempt on target before the break although they were unlucky not to score following a scramble inside the six yard box after the Dundee defence had failed to clear a corner.
Inverness continued to press for an equaliser but they were unable to test Bain in the Dundee goal and they duly punished once more as the home side doubled their lead.
It was a poor one to concede for the visitors too as defender Kostadin Gadzhalov rose highest to beat Fon Williams with a glancing header from Tom Hateley’s free kick.
Carl Tremarco pulled a goal back for Inverness when he beat Bain with a looping header but it was too little, too late for the visitors who also had Lewis Horner sent off in injury time for hauling Wighton to the ground as he ran clear of goal.