Alpenglow Mainnet Launch

Solana (SOL) · Releases & Updates · October 21, 2026

Solana's Alpenglow consensus upgrade goes live on mainnet-beta on Oct 21, 2026 (~14:50 UTC), cutting finality from ~12.8s to ~150ms.

Solana's Alpenglow consensus upgrade is scheduled to go live on mainnet-beta on October 21, 2026, at about 14:50 UTC, core developer Anza announced on October 13. Alpenglow replaces TowerBFT, the consensus Solana has run since genesis, with the Votor voting protocol, targeting transaction finality of about 150 milliseconds instead of roughly 12.8 seconds. Validators will exchange votes directly instead of posting them as on-chain transactions, which frees block space for users but will sharply lower reported transaction counts that include votes. The handoff happens on the running network with no restart, at an epoch boundary, and requires validators on Agave-based clients version 4.3.0 or later. Alpenglow was activated on testnet on September 24 and devnet on September 25, 2026. It is one of the largest Solana protocol upgrades to date.

Last verified: · Source: x.com

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