https://cryptoslate.com/ethereums-arrow-glacier-upgrade-delays-difficulty-bomb-until-june-2022/
Ethereum's Arrow Glacier upgrade delays Difficulty Bomb until June 2022
Nov 12, 2021 - The Arrow Glacier network upgrade will delay the difficulty bomb until June 2022, which is when Ethereum should transition to POS.
arrow glacieruntil juneethereumupgrade