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Solana Changelog
Solana Changelog is a weekly record of protocol changes, validator releases, RPC improvements, SDK updates, and developer tools shipping across the ecosystem.
Release log
October 2026
Agave v4.3.2 and Firedancer v26.10.4 arrive with new program SDKs and work on Alpenglow, validator I/O, gossip, and Transaction V1.
Solana Web3.js v3.1 lands alongside Agave and Firedancer releases, plus updates on CU limits, Alpenglow, and validator performance.
web3.js v3 is ready for general use, while Solana activates a feature gate to cut slot times from 250ms to 200ms after one epoch.
Devnet lists Alpenglow as a notable feature gate alongside new Agave, Firedancer, Superbank, Web3.js, Kit, and program SDK releases.
September 2026
Agave v4.3.0 and Firedancer v26.09.4 ship alongside proposals for 4,096-byte transactions, deterministic ordering, and BN254 support.
Transaction V1 reaches mainnet as Solana targets 250ms slots, lower rent, and program deployments with four times lower fees.
V1 transaction activation is delayed to Epoch 1035, alongside new Agave, Firedancer, Web3.js, Solana Kit, and program releases.
Firedancer adopts three RPC calls and advances ARM support, while three mainnet feature gates and new Agave, Web3.js, and Solana Kit versions land.
August 2026
V1 Transactions are approaching, while a 300ms slot-time feature gate reached Mainnet and new releases shipped across Solana tooling.
Feature gates reduced mainnet slot times from 400ms to 350ms, while Agave, Firedancer, and Solana Kit shipped updates.
Slot times to 250ms on testnet and releases from Agave and Firedancer.
Agave, Firedancer, Frankendancer, SDK, and testing-tool releases shipped as 350ms slot-time gates reached Devnet and Testnet.