Solana’s Alpenglow upgrade is scheduled for mainnet-beta on Wednesday, October 21, 2026, at about 14:50 UTC; it replaces TowerBFT with Votor, targeting roughly 150 ms finality instead of about 12.8 seconds. Anza Solana Foundation

Solana’s Alpenglow upgrade is scheduled for mainnet-beta on Wednesday, October 21, 2026, at about 14:50 UTC; it replaces TowerBFT with Votor, targeting roughly 150 ms finality instead of about 12.8 seconds. Anza Solana Foundation

At activation, validators switch from vote transactions to direct validator votes and aggregate certificates. The SVM and transaction execution stay unchanged, so most app developers need no migration; validators and infrastructure reading vote, block, or finality data are the main groups affected. Solana Foundation

Validator operators need an Agave-based client before activation. Anza describes the migration as a one-slot handoff after 18 months of work. Solana Foundation Anza

Rotor, which is intended to replace Turbine’s block propagation, is a later phase and is not part of this activation. Anza