The U.S. Postal Service will stop selling its 50-cent Forever Stamps on Jan. 27, and increase the price of a first-class letter to 55 cents. While 2019 post office price changes vary by mailing service, the fees rolling out the last Sunday of the month will increase prices by 2.5%.

The nickel increase in a first-class letter is the largest percentage rise since 1991, when postage increased from 25 to 29 cents. The cost of mailing letters over 1 ounce will decrease, with each additional ounce decreasing from 21 cents to15 cents. Mailing a 2-ounce letter, a wedding invitation’s typical weight, will cost 70 cents instead of 71 cents.

Postcard card rates will remain the same at 35 cents. Priority Mail prices will jump by 5.9 % on average. A small package that previously cost $7.20 will rise to $7.90, while a medium box will jump from $13.65 to $14.35.