Loopring, the Ethereum Layer2 protocol, posted on social media that due to recent security bugs in Loopring's two-factor authentication (2FA) service, the automatic upgrade of smart contracts scheduled for June 12 on the Ethereum mainnet has been postponed. The upgrade will be carried out at a later date and the upgrade date will be announced in advance. Please note that this security bugs will not affect the security of our smart contracts. Both existing and new smart contracts remain secure.