> ## Documentation Index
> Fetch the complete documentation index at: https://optimism-373f39ad-mds-systemconfig-remove-unused-getters.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Network Notices

> Active upgrade notices, deprecations, and network change announcements for OP Stack operators.

Notices are time-bound action items for application developers, node operators, and chain operators: upcoming
network upgrades, deprecations, and operational changes. Each hardfork also
has a permanent entry in the
[hardfork registry](/op-stack/protocol/network-upgrades) recording its
activation times, governing spec, and minimum component versions, and
contract-only upgrades are listed in the registry's
[contract upgrades table](/op-stack/protocol/network-upgrades#contract-upgrades) —
notices are archived after activation, registry pages are forever.

## Network upgrades

<CardGroup cols={1}>
  <Card title="Interop Activation Prep" href="/notices/interop-prep" icon="circle-info" horizontal>
    OP Sepolia and Unichain Sepolia interop activation preparation
  </Card>
</CardGroup>

## Operations

<CardGroup cols={1}>
  <Card title="Specialized Node Topology" href="/notices/specialized-node-topology" icon="circle-info" horizontal>
    Guidance for Supernode and Light CL node topology
  </Card>
</CardGroup>