VeChainThor is scheduled to activate the Interstellar hardfork on Sept. 16, 2026, at block 25,902,540, following a VIP-255 vote that passed on VeVote from Aug. 10 to 17. The upgrade incorporates 11 Ethereum improvement proposals from the Cancun, Prague and Osaka upgrades, bringing changes to storage, memory copying, cryptography, gas limits and block-size handling. It does not involve a token migration, new contract addresses, changes to VET supply, VTHO generation or staking rules, and does not include blob transactions. Holders using self-custody do not need to act, while node operators must install Thor v2.5.0 before activation. Exchanges are expected to pause VET deposits and withdrawals, with Binance announcing a suspension at 10:15 UTC on Sept. 16 while trading continues. A Sept. 12 measurement found 105 unique peers connected to one public node, with 21% still identified as running v2.4.x, although the sample does not show the software versions of block-producing authority nodes.