They never did

This happened in 2013, when Harry Reid of the Democratic Party raised a point of order that "the vote on cloture under rule XXII for all nominations other than for the Supreme Court of the United States is by majority vote". The presiding officer overruled the point of order, and Reid appealed the ruling. Mitch McConnell of the Republican Party raised a parliamentary inquiry on how many votes were required to appeal the chair's ruling in that instance. The presiding officer replied, "A majority of those Senators voting, a quorum being present, is required." Reid's appeal was sustained by a 52–48 vote, and the presiding officer then ruled that the Senate had established a precedent that cloture on nominations other than those for the Supreme Court requires only a simple majority. On April 6, 2017, that precedent was further changed by McConnell and the Republican majority, in a 52–48 vote, to include Supreme Court nominations.

Just need 51 votes to remove the filibuster