SIMD-0385
Transaction V1
4,096-byte transactions in a new wire format: resource limits move into the message, lookup tables are gone, and un-upgraded readers start failing the moment it activates.
Transaction V1 is active on Solana mainnet since epoch 1035 — activated 5 weeks ago.
- mainnet
- active since epoch 1035 · 5 weeks ago
- testnet
- active since epoch 1025 · 7 weeks ago
- devnet
- active since epoch 1140 · 6 weeks ago
Telegram alertsKnow the moment an upgrade is queued — join @xrootdev_updates or message the bot /start for a DM.
The full guideWhat breaks, what to check, and how to prepare →How we know
Solana ships protocol changes behind on-chain switches called feature gates. This page reads the switch itself about every minute — once an activation is requested, it completes at the next epoch boundary, which is where the countdown comes from. No announcements, no invented dates.