Solana moves Alpenglow into testnet as SOL nears January highs

1. #0109.23
   Initial2026-09-23 14:40 · publication time

   Solana moves Alpenglow into testnet as SOL nears January highs

   Solana began rolling its Alpenglow consensus upgrade onto testnet, the first public deployment of the TowerBFT replacement targeting roughly 150-millisecond finality while leaving the SVM, transactions, programs and fees unchanged.

   Source evidence: CryptoSlate

2. #0209.26
   Confirmation2026-09-26 05:00 · publication time

   Solana’s 150-millisecond settlement upgrade reaches second public test network

   Alpenglow is now running on both devnet and testnet; the devnet switch was announced Sept. 25, and the testnet transition completed the day before, with mainnet launch still unscheduled.

   State after update: Solana's Alpenglow consensus upgrade is running on both public test networks, devnet and testnet, for developer testing, with mainnet launch not yet scheduled.

   Source evidence: CoinDesk

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