Ethereum developers have scheduled the Berlin hard fork for April 14 at block height 12,244,000, according to the Ethereum All Core Developers meeting Friday.

The hardfork includes various optimizations for contracts including gas efficiencies, updates to how code is read by the Ethereum Virtual Machine (EVM) and other changes to protect against denial-of-service (DDOS) attacks.

The Berlin hard fork was originally scheduled for June or July 2020, but was pushed back mainly due to centralization concerns around the Geth client on which most Ethereum nodes run. Moreover, developers working on the current base layer blockchain, often called Eth 1.x, have expressed strain from maintaining the client. 

Read more: Ethereum Developers Delay Berlin Hard Fork to Stem Client Centralization Concerns

The Berlin hard fork has been preceded by multiple testnets. The update, which includes at least five Ethereum Improvement Proposals (EIP), will be shipped on four test networks before deployment as well.

Correction (Feb. 19, 17:45 UTC): A previous version of this article stated Berlin included an EIP necessary for the Ethereum 2.0 merge. However, that EIP is not currently slated for inclusion.