Ethereum Istanbul Upgrade Announcement

The Ethereum network will be undergoing a scheduled upgrade at block number 9,069,000, which is predicted to occur on Saturday, December 7, 2019. The exact date is subject to change due to variable block times and timezones.

Please upgrade your node before Sunday, December 1, 2019 to account for the variable block times. has kindly provided Istanbul node statistics and a countdown timer located at You can monitor the network upgrade in real time at

Istanbul is the name given to this network upgrade. Previous network upgrades have been given other names such as Costantinople, Spurious Dragon, and Byzantium.

If you use an exchange (such as Coinbase, Kraken, or Binance), a web wallet service (such as Metamask, MyCrypto, or MyEtherWallet), a mobile wallet service (such as Coinbase Wallet,, or Trust Wallet), or a hardware wallet (such as Ledger, Trezor, or KeepKey) you do not need to do anything unless you are informed to take additional steps by your exchange or wallet service.

Download the latest version of your Ethereum client:

NOTE: Harmony (ethereumJ) is now a deprecated client and will not be supporting Istanbul. Besu is a mainnet compatible Ethereum client written in Java.

If you are using an Ethereum client that is not updated to the latest version (listed above), your client will sync to the pre-fork blockchain once the upgrade occurs. You will be stuck on an incompatible chain following the old rules and you will be unable to send ether or operate on the post-upgrade Ethereum network.

A network upgrade is a change to the underlying Ethereum protocol, creating new rules to improve the system. The decentralized nature of blockchain systems makes a network upgrade more difficult. Network upgrades in a blockchain require cooperation and communication with the community, as well as with the developers of the various Ethereum clients in order for the transition to go…

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