October 17, 2026
Solana’s Alpenglow Goes Live Oct. 21: TowerBFT Out, ~150 ms Finality Target In, and Why TPS Charts Are About to “Crash”
Solana switches consensus from TowerBFT to Alpenglow at epoch 1064 (around 15:00 UTC on Oct. 21). Validators need an Agave 4.3-based client (Anza recommends v4.3.2), Firedancer can’t do the migration, and vote transactions disappear from blocks.