Solana schedules Alpenglow upgrade for October 21, 2026, targeting 150 ms finality, down from 12.8 seconds
Solana will activate its Alpenglow network upgrade on October 21, 2026, in step with Epoch 1064. The upgrade targets cutting transaction finality from about 12.8 seconds to roughly 150 milliseconds, after governance proposal SIMD-0326 passed with 98.27% support. Under the new mechanism, a block finalizes immediately in the first round when at least 80% of stake backs it, while support between 60% and 80% sends it to a second round decided by a 60% threshold. Validators must meet new software requirements and pay a 0.8 SOL admission fee, a change intended to sharpen the network's performance and efficiency.