Solana sets Oct. 21 Alpenglow upgrade with 150ms finality target

Solana’s developers have scheduled the Alpenglow consensus upgrade for Oct. 21, targeting roughly 150-millisecond finality while asking validators and application operators to prepare for changes during the mainnet handoff. Solana’s Alpenglow upgrade is scheduled for Oct. 21, targeting roughly 150-millisecond transaction finality. Quicknode warns of a brief transaction pause and possible data-stream interruptions during the handoff. Validators must use compatible software and fund vote accounts for the 0.8 SOL admission fee. Some RPC nodes may receive finality information later than validators participating directly in consensus. Quicknode’s maintenance notice identifies Wednesday as the planned activation day, but its latest update warns that the original 14:50 UTC estimate could move forward to 13:20 UTC as block production advances.

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