West Ham United's Angelo Ogbonna headed a second-half winner to give David Moyes' side a hard-fought Premier League victory at Everton.
In a game of few clear-cut chances, defender Ogbonna netted the only goal in the 74th minute, rising inside the six-yard box to flick home Jarrod Bowen's corner.
The Hammers dominated the first half but lacked incisiveness in the final third and called Jordan Pickford into action just once.
The England keeper palmed out Bowen's stinging shot and while Tomas Soucek thought he had found the breakthrough with his follow-up from close range, it was ruled out for offside.
Alex Iwobi missed a glorious opportunity for Everton when he failed to make any contact with the ball from six yards out then in the second half the Nigeria forward's spin and strike was blocked.
The Toffees could not find an equaliser as their winning run in the league under Rafael Benitez at Goodison Park ended.
West Ham's victory takes them up to sixth in the table as they leapfrog Everton, who drop to seventh.