Solana developer Anza said the Alpenglow upgrade is scheduled to reach mainnet-beta on October 21 at approximately 14:50 UTC. The source gives no year, and the rollout has not been reported as completed. Anza says the upgrade aims to cut transaction finality from a reported 12.8 seconds to about 150 milliseconds.
Alpenglow is designed to replace Solana’s TowerBFT consensus protocol and let validators exchange votes directly rather than record them as on-chain transactions. That could free blockspace, but the source says a successful rollout would not guarantee an immediate rise in SOL’s price.
