WASHINGTON (AP) – The United States Supreme Court ruled Tuesday that a key provision of the landmark Voting Rights Act cannot be enforced unless Congress comes up with an up-to-date formula for deciding who still needs federal monitoring.

The justices said in 5-4 vote that the law Congress most recently renewed in 2006 relies on 40-year-old data that does not reflect racial progress and changes in U.S. society.

The court did not strike down the advance approval requirement of the law that has been used, mainly in the South, to open up polling places to minority voters in the nearly half century since it was first enacted in 1965. But the justices did say lawmakers must update the formula for determining which parts of the country must seek Washington’s approval, in advance, for election changes.