Solana Transaction V1 Goes Live Sept 10, 2026: Key Breaking Changes for Developers

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Solana's Transaction V1 is set to activate on mainnet on September 10, 2026, raising the maximum transaction size from 1,232 bytes to 4,096 bytes in a format incompatible with older client libraries. The Agave 4.2 release, which shipped on August 11, 2026, introduced the framework for these changes, though each update activates separately via its own feature gate. Developers must set maxSupportedTransactionVersion: 1 on RPC calls such as getBlock and getTransaction, or risk a -32015 error that fails the entire block query. Priority fee handling has also changed: V1 moves compute budget data to the transaction header, reporting fees as a total in lamports rather than micro-lamports per compute unit, so existing fee-parsing code will silently return zero. Additionally, Agave 4.2 no longer emits updates for accounts that were write-locked but unchanged, resulting in roughly 80 percent fewer account-update events in streams and RPC responses.

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