Do I need to buy 3-cent stamps to make new 66-cent postal rate hike (July 9)?

The FOREVER stamp, sold at post offices and other vendors,

will cost 66 cents from those sellers; the previous "Forever" can be

used on first-class mail (1 oz.) as the Postal Service honors the

variable-rate stamps.

http://faithfor2008.blogspot.com/2023/06/postal-rate-increase-at-july-9-up-3.html