People mailing packages through the U.S. Postal Service will pay more beginning this week, as the agency temporarily raises shipping prices amid rising fuel costs.

USPS announced Wednesday, March 26, that it will increase the cost of shipping packages by 8% for a limited time to “better align its costs of transportation with the market,” according to a news release.

The increase applies to the following products:

First‑class mail stamps and other USPS products are not affected. The price changes took effect at midnight Thursday, March 26.

The changes in USPS's pricing come as oil, gasoline and diesel prices have shot up since the United States and Israel launched attacks on Iran.