Solana Raises Transaction Size Limit to 4,096 Bytes in Mainnet Upgrade
Transaction Size Limit More Than Triples on Solana Mainnet
Solana has increased its maximum transaction size from 1,232 bytes to 4,096 bytes. The upgrade was activated on the mainnet on September 15, 2026, around 1:00 am UTC, at epoch 1,035.
Key Points of the Upgrade
- The new limit is over three times larger than the previous one.
- It introduces a v1 transaction format that remains compatible with older transactions.
- Developers must update to v1 transactions to use the increased size.
What the Solana Foundation Says
A spokesperson for the Solana Foundation explained that the upgrade aims to help developers fit more complex operations into a single transaction, such as zero-knowledge proofs and transactions with multiple signatures.
Confirmed Facts from Blockchain Data
- The upgrade was confirmed through blockchain data shared by the Solana Foundation.
- Existing transaction formats continue to work without changes for applications and wallets.
- The activation occurred at epoch 1,035 as planned.
Why This Upgrade Matters for Developers
The larger transaction size allows developers to handle workloads that previously couldn't fit into one transaction. This includes zero-knowledge proofs, which are methods to verify information without revealing the data itself, and new on-chain signature schemes.
Recent Solana Improvements
Solana has made other changes recently. In August, it reduced slot time—the time between blocks—from 400 milliseconds to 350ms. Validators also approved a proposal to double the network's annual disinflation rate, which reduces future issuance of SOL, the native token.