Solana released version 3 of its JavaScript SDK, @solana/web3.js, on October 6, 2026. This update rebuilds nine legacy protocol classes on Solana Kit, the toolkit introduced in February 2025, to reduce application bundle sizes and simplify dependencies. The SDK records over three million downloads per week, meaning the changes have a substantial impact on the ecosystem. The modifications introduce breaking changes: synchronous methods become asynchronous, numeric values must now use bigint, and account data shifts to Uint8Array. Version 3.0.0 is expected to be set as the default version around October 19, 2026, while version 1 moves to maintenance-only status.
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