Pokémon Sleep has announce that Version 1.6.0 will be released on April 30th, 2024, and it has New Features and Game Contents. Maintenance will be conducted from April 29th, 2024 at 21:00 until April 30th, 2024 at 1:30

Maintenance and Version 1.6.0 Update

In order to update the app’s version, maintenance will be conducted during the following time period.

Maintenance Period
Starts:2024/04/29 21:00
Ends:2024/04/30 01:30

New Features

■ Preparation for new events
For details, please see the announcements that will be posted at a later date.

■ Addition of a new item, “Fire-Type Candy”
Using a Fire-Type Candy on a Fire-type Pokémon—either from your bag’s items pocket or from the Pokémon details screen—will exchange it for that Pokémon’s candies.

Examples using a Fire-Type Candy S:
• Used on Charizard → Charmander Candy ×4
• Used on Flareon → Eevee Candy ×4
Note: Additions of other types of candy are scheduled for later updates.

■ Addition of a new Relaxing Sound, “Waves”

Game Contents

■ Partial adjustment to helper Pokémon’s Energy recovery from cooking The following change will be made to the Energy recovery of helper Pokémon who already have 100 or more Energy.
• Energy recovery before change: 0 → Energy recovery after change: +1

■ Adjustments to which Pokémon appear in some areas
You’ll be able to encounter the following Pokémon in the listed areas.
Greengrass Isle
• Vaporeon, Flareon, Bayleef, Meganium, Quilava, Typhlosion, Croconaw, Feraligatr, Espeon, Umbreon, Glaceon

Taupe Hollow
• Arcanine, Quilava, Typhlosion, Houndoom

Source: https://www.pokemonsleep.net/en/news/5699/