v2.5.1 is a recommended maintenance release on top of v2.5.0: stability and validation fixes, no hardfork, no genesis/config change, no resync.
It includes the Zanzibar hardfork from v2.5.0 (MainNet block 53533081, est. 2026-10-19 02:00 UTC); nodes still on v2.4.x should upgrade straight to v2.5.1.
Docker: ghcr.io/iotexproject/iotex-core:v2.5.1 (linux/amd64, linux/arm64)
Binaries: iotex-core linux-amd64 / darwin-arm64, ioctl linux / darwin / windows, each with a .asc signature. macOS assets are now named darwin-arm64.
Release note: https://github.com/iotexproject/iotex-bootstrap/blob/master/changelog/v2.5.1-release-note.md