diff --git a/docs/base-chain/network-information/configuration-changelog.mdx b/docs/base-chain/network-information/configuration-changelog.mdx
index 92eb2830c..a85a8eaa1 100644
--- a/docs/base-chain/network-information/configuration-changelog.mdx
+++ b/docs/base-chain/network-information/configuration-changelog.mdx
@@ -10,6 +10,7 @@ This page tracks configuration changes to the Base networks, including updates t
 
 | Date | Change | Documentation |
 |------|--------|---------------|
+| February 10, 2026 | Upgrade 18: Cannon + Kona fault proof support | [Fault Proof Diversity](/base-chain/network-information/transaction-finality#fault-proof-diversity) |
 | February 4, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/base-chain/network-information/network-fees#eip-1559-fee-parameters) |
 | February 2, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee) |
 | January 22, 2026 | Increased Minimum Base Fee to 1,000,000 wei | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee) |
@@ -26,6 +27,7 @@ This page tracks configuration changes to the Base networks, including updates t
 
 | Date | Change | Documentation |
 |------|--------|---------------|
+| February 10, 2026 | Upgrade 18: Cannon + Kona fault proof support | [Fault Proof Diversity](/base-chain/network-information/transaction-finality#fault-proof-diversity) |
 | November 20, 2025 | Enabled Minimum Base Fee (200,000 wei) | [Minimum Base Fee](/base-chain/network-information/network-fees#minimum-base-fee) |
 | September 3, 2025 | Enabled Per-Transaction Gas Maximum | [Per-Transaction Gas Maximum](/base-chain/network-information/block-building#per-transaction-gas-maximum) |
 | February 25, 2025 | Enabled Flashblocks | [Flashblocks](/base-chain/network-information/block-building#flashblocks) |
diff --git a/docs/base-chain/network-information/transaction-finality.mdx b/docs/base-chain/network-information/transaction-finality.mdx
index 01ae09508..7551cf1aa 100644
--- a/docs/base-chain/network-information/transaction-finality.mdx
+++ b/docs/base-chain/network-information/transaction-finality.mdx
@@ -70,6 +70,23 @@ This system requires only a one honest party to remain secure. Base will always
 Note: if the dispute game is won by a challenger, the state of the L2 chain does not reorg. The output proposal is marked invalid and any withdrawals that were proven against it cannot finalize. Those withdrawals would need to be re-proven against a different, valid output root.
 </Accordion>
 
+### Fault Proof Diversity
+
+As part of [Upgrade 18], Base supports two independent fault proof implementations running in parallel:
+
+| Game Type | Implementation | Description |
+|-----------|----------------|-------------|
+| `CANNON` (0) | op-program (Go) | Original fault proof using `op-node` + `op-geth` |
+| `CANNON_KONA` (8) | kona-client (Rust) | Alternate fault proof using `kona-node` + `op-reth` |
+
+Both implementations use Cannon as the Fault Proof Virtual Machine (FPVM) and share the same dispute game contract (`FaultDisputeGame.sol`). This diversity increases redundancy in the fault proof layer—if a bug affects one implementation, the other can still secure the network.
+
+<Note>
+Games of either type can be created after upgrade, but withdrawals continue to use the respected game type configured by governance.
+</Note>
+
+[Upgrade 18]: https://docs.optimism.io/notices/upgrade-18
+
 ## FAQ
 
 <AccordionGroup>