Solana Network Upgrade Set for September 9: Transaction Size Limits Tripled
The Solana network is set to undergo a major upgrade on September 9, which will increase the maximum transaction size from 1,232 bytes to 4,096 bytes. This change is aimed at giving developers more space to fit complex operations into a single atomic transaction, including zero-knowledge proofs, large multisignature approvals, and confidential transfers.
The new format, known as Transaction v1, removes Address Lookup Tables (ALTs) and stores resource limits in a dedicated configuration section. This will require infrastructure providers such as RPC services, indexers, and explorers to update their software to avoid errors or incorrect data display.
The upgrade is backward compatible, with legacy and v0 formats continuing to operate under existing limits. However, developers must deliberately adopt v1 to access its larger capacity. The change does not introduce a per-byte fee, but larger transactions may increase bandwidth demand and priority-fee competition.
Jacob Creech, the Solana Foundation's vice president of technology, identified September 9 as the planned rollout date for Transaction v1. The upgrade is part of Anza's Agave 4.2 release, which has already gone live on Solana's testnet and devnet environments.