Solana’s Alpenglow upgrade is scheduled for mainnet-beta on October 21 at about 14:50 UTC. It replaces TowerBFT with Votor, targeting finality of roughly 150 ms instead of about 12.8 seconds, in a one-slot migration after 18 months of work. Anza’s announcement

Solana’s Alpenglow upgrade is scheduled for mainnet-beta on October 21 at about 14:50 UTC. It replaces TowerBFT with Votor, targeting finality of roughly 150 ms instead of about 12.8 seconds, in a one-slot migration after 18 months of work. Anza’s announcement

Validators will exchange votes directly rather than submit vote transactions on-chain, so transaction counts that include votes may fall. The SVM and transaction execution stay unchanged, so most app developers need no migration; validator operators and infrastructure that reads vote, block, or finality data are most affected. Solana Foundation’s upgrade overview

Rotor, the planned replacement for Turbine block propagation, is a later phase and is not part of this activation. Anza’s Alpenglow details