Optimism will cease support for op-geth and op-program on May 31.

PANews reported on March 5th that, according to an official announcement from Optimism, support for op-geth and op-program will cease on May 31, 2026. Users will need to migrate to op-reth and cannon-kona. As the ecosystem matures, Optimism is transitioning full execution client support to op-reth, while the fault-proofing procedure is migrating from op-program to kona-client.

After May 31st, op-geth will no longer receive security patches and critical vulnerability fixes. New feature development (including the next Karst hard fork) will only be conducted on op-reth. Current op-program deployments are expected to remain available until the Karst hard fork, at which time chain operators will need to migrate to kona-client. op-geth will not support the L1 Glamsterdam hard fork, and chains still running op-geth will not be able to follow the canonical chain after activation. All node operators should migrate to op-reth as soon as possible, allowing sufficient time for verification.