By Isaac • October 14, 2026 3:12 pm •
Solana has put a date on one of the most important consensus changes in the network’s history.
Alpenglow is scheduled to activate on mainnet-beta when epoch 1064 begins on Wednesday, October 21, at roughly 14:50 UTC. The upgrade will replace TowerBFT, move validator voting out of normal block transactions and target transaction finality of about 150 milliseconds.
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That is a dramatic change from the roughly 12.8 seconds required for full finality under the current system. A Solana transaction can appear confirmed much sooner today, but applications handling meaningful value often wait for the stronger guarantee that the transaction cannot be reversed.
It’s time.
Alpenglow goes live on mainnet-beta Wednesday, October 21, ~14:50 UTC.
18 months
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