Pokémon Sleep has announce that Version 3.1.0 will be released on November 26th, 2025, and it adds New Features and includes Bug Fixes. You will need to update to the latest version through your app store.

Update Contents

New Features Preparation for a new event
Packed Portions Cooking Week Part 2 - Please see the event’s upcoming News announcement for more details.

Balance Adjustments
Adjustments to certain helper Pokémon’s main skills and main skill chance

Delibird
Before change: Ingredient Magnet S
After change: Present (Ingredient Magnet S)
Gets you ingredients chosen at random. Sometimes also gets candy for one randomly selected Pokémon on your team. The number of ingredients obtained will be less, but the main skill chance increases.

Notes: Main skill levels will be maintained after the update.
Main skills of Pokémon you have already befriended will also change.

Adjustments to special appearance rates
Starting with New Moon Day #8, if you encounter a Pokémon with a special appearance rate, the number of Pokémon you encounter during that sleep research will increase by one.

Normally, if you conduct sleep research twice in one day and research at least 11 Pokémon in a single day, the research rewards for the eleventh and any subsequent Pokémon will be less. However, if you encounter a Pokémon with a special appearance rate, the research rewards will be less starting with the twelfth—and any subsequent—Pokémon.

Other

• Some text adjusted or unified
• Other small bug fixes and adjustments

Source: https://www.pokemonsleep.net/en/news/333338313036323038303638303432373533/