Solana research and development firm Anza announced that Solana's Alpenglow v4.3.2 upgrade is scheduled for mainnet-beta activation on October 21, 2026, at epoch 1064 around 14:50 UTC.

From the articleSolana's Alpenglow test migration success sets stage for mainnet activationAlso in Solana sets October 21 for massive Alpenglow upgrade that could make transactions 99% faster to finalize, Solana's Alpenglow Upgrade Arrives Oct. 21 With a Major Speed Boost