By Isaac • September 16, 2026 3:07 pm •
Solana has switched on a long-awaited upgrade that gives developers far more room inside a single transaction.
The network’s new v1 transaction format is now live on mainnet, raising the maximum transaction size from 1,232 bytes to 4,096 bytes. That is a roughly 3.3-fold increase, and it removes a practical constraint that has shaped how Solana applications package complex operations.
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According to the Solana Foundation’s technical overview, the txv1 feature activated at the start of epoch 1035 on September 15. The upgrade is also active on testnet and devnet.
Why 4,096 bytes matters
The extra space is about what can fit inside one transaction, not a direct increase in transaction count. One transaction can carry more
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