Solana Changelog: October 8, 2026

This is a weekly newsletter on the latest Solana engineering news this week. If you want to stay updated on Solana tech every week, follow Solana Changelog at @solana_devs and @readylayerone and turn on notifications.

PSA

npm install @solana/web3.js@3

The new web3.js package is now ready for general use. To migrate to the new version, add the dependency to your project using the command above.

For now, you will have to call the version explicitly, and there will be moves to have it be the default version you install without the version tag.

See the advisory here.

Releases

Notable feature gates

Mainnet

Reduce slot times from 250ms to 200ms

The feature gate is active; shorter slot times go live one epoch after activation.

New versions

• Agave v4.5.0-alpha.1
• Firedancer Testnet Release v26.10.0, Mainnet Release v26.09.6
• Web3.js v3.0.2
• Solana Go v1.25.0
• Wallet Standard v1.1.8
• Stake Program Rust SDK v5.1.1
• Stake Pool Program v2.2.0, CLI v3.0.0
• Anchor v1.2.1
• Mollusk v0.16.0

Ecosystem work

SIMDs

• Requiring hash validation for Loader v2 to Loader v3 migration for programs was proposed

  • WTM - This affects programs deployed by the runtime, not Solana programs deployed by users. This change will ensure that migrations check that the content is the same before adopting the program broadly by the cluster.

• Simplifying the runtime environments to a single service was proposed

  • WTM - Currently there are two runtime environments, one for the current slot and another for the next slot. This change combines both runtimes since previous work would allow program deployments within the same slot without downtime for that slot.

• Removing the ExtendProgram instruction from the Program Loader V3 Program was proposed

  • WTM - The new instruction for upgrading programs has since been updated to automatically extend the program length as needed during an upgrade. This change removes a legacy instruction that preemptively extended the program length via a separate instruction before updating.

• Allowing prefunding SOL on LoaderV3 Buffer accounts was proposed

  • WTM - This change builds on work already done on the CreateAccountAllowPrefund instruction. It allows ProgramData to be written to accounts that already exist and hold SOL.

Validator clients (Agave, Firedancer, Mithril)

• Agave will implement a faster random number generator for peer sampling in its gossip implementation

  • WTM - Agave plans to use a weighted shuffle for gossip peer selection. Gossip allows nodes to exchange network addresses, stake, credentials, and other information with a subset of the cluster. The faster random number generator improves this selection process and supports future work to select geographically closer peers to reduce latency.

• Agave will increase the default snapshot interval to 200,000 slots

  • WTM - Since slot times have decreased, full snapshots would otherwise be created more often than necessary. Increasing the default interval keeps snapshot production at the same rate as slots become faster.

RPC 2.0

• Cloudbreak is improving its queries of token mints and token accounts
  • WTM - Cloudbreak is the open-source RPC implementation for account state. This change routes token mint and token account data requests to a separate getProgramAccounts request onchain.

Solana language clients (Web3.js, Solana Kit, Kit plugins, Solana SDK, Codama, Solana Go)

• Solana Rust SDK added helpers for signing versioned transactions
  • WTM - Versioned transactions are increasingly important following the rollout of Transaction V1. These methods support multiple signers on a transaction.

Solana program frameworks (Anchor, Pinocchio, Steel, Quasar)

• Anchor’s TypeScript provider created a new type to simplify instruction account resolution

  • WTM - Anchor maintains a TypeScript provider that allows web apps to interact with program methods. As the provider moves from legacy web3.js to Kit, this change simplifies a type used to resolve accounts for an instruction.

• Pinocchio will add instruction helpers for token metadata and token groups in its crate for interacting with the Token-2022 program

  • WTM - Pinocchio does not yet support instructions for the Token Metadata and Token Group extensions. Adding these helpers allows Pinocchio to interact with both extensions.

Other interesting things

• @anza_xyz held a livestream detailing the migration period of a Solana cluster from TowerBFT to Alpenglow

• @SolanaFndn released Solana DvP, a platform for settlement based on institutional security practices

• @GregoryCusack shared a Gossip service traffic profile showing a decrease in gossip-related operations

• @triton_one released AccountSyncSDK

• The RustConf 2026 talks are live, including @zolana’s talk on the wincode crate and @deanmlittle’s talk on the rustc compiler

• @rektoff_xyz announced its sixth security course cohort

• @_rustopian discussed how some check patterns in Solana code could create security risks

• @mikemaccana from @QuickNode gave a Solana Fall School lecture on how a managed fund could work on Solana

• @jacobdotsol created a tool for storing transactions as templates onchain and executing them against runtime state

• @senyor_kodama created a visualization of how leader-network latency could change under the proposal to make validator nodes more geographically aware

• Solana Keychain v2.0 was released

• @nocircuit released an interview with @Ashwinningg, who was primarily responsible for the Alpenglow implementation

Open Developer Roles

• Jito Labs is hiring

Last Week’s Issue

Changelog·Oct 1, 2026

Solana Changelog: October 1, 2026

Devnet lists Alpenglow as a notable feature gate alongside new Agave, Firedancer, Superbank, Web3.js, Kit, and program SDK releases.