Solana Transaction V1 mainnet activation stories

Sep 7, 2026

Solana to triple transaction size to 4,096 bytes with v1 upgrade

Solana plans to implement Transaction v1 on September 9, raising the maximum serialized transaction size from 1,232 bytes to 4,096 bytes. The upgrade will enable applications to execute more complex trades and operations on the blockchain.

Sep 7, 2026

Aug 30, 2026

Solana sets Sept. 9 date for Transaction V1 upgrade

Solana Foundation Vice President of Technology Jacob Creech announced on Aug. 30 that the Transaction V1 upgrade is scheduled for Sept. 9, with a network rent reduction also planned as part of upcoming improvements to the blockchain.

Aug 30, 20261 source