The patch, which was outed last month, will be available to download on August 6, reports Andriasang.
In addition to adding PS3 Trophy support, it will also enable players to install the game onto the hardware, reducing loading times.
It appears ahead of a reported Metal Gear Solid 4 budget re-release, which is also due to hit stores in August.
Currently only confirmed for Japan, it is not yet clear whether the patch will be pushed out globally next week or at a later date.
Konami is also planning a Metal Gear Solid 25th Anniversary Event on August 30, in which series creator Hideo Kojima will make a special announcement.
The announcement is said to be related to Kojima's vision of connecting people through games.
It is thought that Metal Gear Solid: Peace Walker's Transfarring system served as a test for this vision.
Metal Gear celebrated its 25-year anniversary last month. The original game in the series, Metal Gear for the MSX2, was released on July 7, 1987 in Japan.
A total of 31 million Metal Gear games have been sold to date.
The next title in the franchise - Metal Gear Rising: Revengeance - will be released next year.
> 'Metal Gear' retrospective: A look at Hideo Kojima's stealth series
Screenshot gallery - view images from the Metal Gear franchise below: