The cost of a first-class stamp will rise to 42 cents starting May 12, the U.S. Postal Service said Monday.

The price of the Forever stamp will go up at the same time, meaning those stamps can still be purchased for 41 cents but will remain good for first-class postage after the rate increase takes effect.

The post office has sold 5 billion Forever stamps since they were introduced last April and plans to have an additional 5 billion in stock to meet the expected demand before the May price change, the agency said.

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