Migrate to Room 3 - #295

Version 3.0.0-alpha01
March 11, 2026

androidx.room3:room3-*:3.0.0-alpha01 is released.

Room 3.0 (package androidx.room3) is a major version update of Room 2.x package (androidx.room) that focuses on Kotlin Multiplatform (KMP).

The core annotation APIs are kept the same along with the main components:

An abstract class that extends androidx.room3.RoomDatabase and is annotated with @Database is the entry point for Room's annotation processor.
The database declaration has one or more data classes describing the database schema and are annotated with @Entity.
Database operations are defined in @Dao declarations that contains query functions whose SQL statements are defined via the @Query annotation.
At runtime, the database implementation can be obtained via a RoomDatabase.Builder which is also used to configure the database.
Most of the documentation in the Save data in a local database using Room guide is still relevant to Room 3.0.

The major breaking differences between Room 2.x are as follows:

New package, androidx.room3.
SupportSQLite APIs are no longer supported, unless you are using the androidx.room3:room3-sqlite-wrapper.
All database operations are now Coroutine APIs based.
Kotlin code generation only.
Kotlin Symbol Processing (KSP) is required.
Along with breaking changes, Room 3.0 brings in new functionality compared to 2.x:

JS and WasmJS Support
Custom DAO Return Types