AI & Machine Learning

Agave 4.2: Transaction V1 Breaking Changes Checklist

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Summary and Key Points

The Solana network is undergoing significant changes with the introduction of transaction version 1 (v1) and reduced slot times. Here are the key points to ensure your service remains compatible:

Transaction Version 1 (v1)

Important Change: The maxSupportedTransactionVersion must be set to at least 1 for any RPC call that retrieves transactions or blocks.
Impact: If this is not set, calls will fail with error code -32015 when encountering v1 transactions.

Reduced Slot Times

Current Time: Mainnet slot time is currently 300ms (since epoch 1024 on August 28, 2026).
Future Changes: The next step to 250ms is pending on mainnet and live on testnet.

SDK Versions

Ensure you are using the latest versions of relevant crates:
- solana-message: 4.1.1 or higher
- solana-transaction: 4.1.6 or higher
- solana-transaction-status: 4.1.2 or higher
- `yellowstone-grpc

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