diff --git a/sepolia/2025-11-03-incident-multisig-signers/.env b/sepolia/2025-11-03-incident-multisig-signers/.env
new file mode 100644
index 00000000..f402116e
--- /dev/null
+++ b/sepolia/2025-11-03-incident-multisig-signers/.env
@@ -0,0 +1,8 @@
+OP_COMMIT=594bc933a38425f745b46399a3619bcdeb74965d
+BASE_CONTRACTS_COMMIT=dcd8c98aa881e0ae4ebf872e0d91692a7bf94000
+
+OWNER_SAFE=0x5dfEB066334B67355A15dc9b67317fD2a2e1f77f
+
+SENDER=0x0CF2F86C3338993ce10F74d6f4B095712c7efe26
+
+RECORD_STATE_DIFF=true
diff --git a/sepolia/2025-11-03-incident-multisig-signers/Makefile b/sepolia/2025-11-03-incident-multisig-signers/Makefile
new file mode 100644
index 00000000..12b464f7
--- /dev/null
+++ b/sepolia/2025-11-03-incident-multisig-signers/Makefile
@@ -0,0 +1,33 @@
+include ../../Makefile
+include ../../Multisig.mk
+include ../.env
+include .env
+
+RPC_URL = $(L1_RPC_URL)
+SCRIPT = UpdateSigners
+
+ifndef LEDGER_ACCOUNT
+override LEDGER_ACCOUNT = 1
+endif
+
+.PHONY: deps
+deps: new-forge-deps
+
+.PHONY: new-forge-deps
+new-forge-deps:
+	forge install --no-git safe-global/safe-smart-account@186a21a74b327f17fc41217a927dea7064f74604
+
+.PHONY: gen-validation
+gen-validation: checkout-signer-tool run-script
+
+.PHONY: run-script
+run-script:
+	cd $(SIGNER_TOOL_PATH); \
+	npm ci; \
+	bun run scripts/genValidationFile.ts --rpc-url $(L1_RPC_URL) \
+	--workdir .. --forge-cmd 'forge script --rpc-url $(L1_RPC_URL) \
+	$(SCRIPT) --sig "sign(address[])" [] --sender $(SENDER)' --out ../validations/base-signer.json;
+
+.PHONY: execute
+execute:
+	$(call MULTISIG_EXECUTE,$(SIGNATURES))
diff --git a/sepolia/2025-11-03-incident-multisig-signers/OwnerDiff.json b/sepolia/2025-11-03-incident-multisig-signers/OwnerDiff.json
new file mode 100644
index 00000000..19afc824
--- /dev/null
+++ b/sepolia/2025-11-03-incident-multisig-signers/OwnerDiff.json
@@ -0,0 +1,11 @@
+{
+  "OwnersToAdd": [
+    "0x5F1955729e3D6129FB73813E891742D473fc74F7",
+    "0x6e427c3212C0b63BE0C382F97715D49b011bFF33"
+  ],
+  "OwnersToRemove": [
+    "0xaa2489DEbF1EF02ab83bA6Cde4419E662De9254E",
+    "0x9B43cC2EF6fa521127Ade09e20efD6ABBC5BF799",
+    "0xf2Fb17eab635f036Da7864B8e39ef8e9A03441df"
+  ]
+}
diff --git a/sepolia/2025-11-03-incident-multisig-signers/README.md b/sepolia/2025-11-03-incident-multisig-signers/README.md
new file mode 100644
index 00000000..344c6f84
--- /dev/null
+++ b/sepolia/2025-11-03-incident-multisig-signers/README.md
@@ -0,0 +1,52 @@
+# Update Sepolia Incident Multisig Signers
+
+Status: READY TO SIGN
+
+## Description
+
+We wish to update the owners of our Incident Multisig to be consistent with the current state of our Base Chain Eng team. This involves removing signers that are no longer closely involved with the team, and adding new team members as signers. The exact signer changes are outlined in the [OwnerDiff.json](./OwnerDiff.json) file.
+
+## Install dependencies
+
+### 1. Update foundry
+
+```bash
+foundryup
+```
+
+### 2. Install Node.js if needed
+
+First, check if you have node installed
+
+```bash
+node --version
+```
+
+If you see a version output from the above command, at or above version `v18.18`, you can move on. Otherwise, install (or update) node.
+
+```bash
+brew install node
+```
+
+## Approving Signers Update
+
+### 1. Update repo:
+
+```bash
+cd contract-deployments
+git pull
+```
+
+### 2. Run the signing tool (NOTE: do not enter the task directory. Run this command from the project's root).
+
+```bash
+make sign-task
+```
+
+### 3. Open the UI at [http://localhost:3000](http://localhost:3000)
+
+Be sure to select the correct task from the list of available tasks to sign.
+
+### 4. Send signature to facilitator
+
+You may now kill the Signer Tool process in your terminal window by running `Ctrl + C`.
diff --git a/sepolia/2025-11-03-incident-multisig-signers/foundry.toml b/sepolia/2025-11-03-incident-multisig-signers/foundry.toml
new file mode 100644
index 00000000..14499ab0
--- /dev/null
+++ b/sepolia/2025-11-03-incident-multisig-signers/foundry.toml
@@ -0,0 +1,20 @@
+[profile.default]
+src = 'src'
+out = 'out'
+libs = ['lib']
+broadcast = 'records'
+fs_permissions = [{ access = "read-write", path = "./" }]
+optimizer = true
+optimizer_runs = 999999
+solc_version = "0.8.15"
+via-ir = false
+remappings = [
+    '@eth-optimism-bedrock/=lib/optimism/packages/contracts-bedrock/',
+    '@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts',
+    '@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts',
+    '@rari-capital/solmate/=lib/solmate/',
+    '@base-contracts/=lib/base-contracts',
+    'solady/=lib/solady/src/',
+]
+
+# See more config options https://github.com/foundry-rs/foundry/tree/master/config
diff --git a/sepolia/2025-11-03-incident-multisig-signers/script/UpdateSigners.s.sol b/sepolia/2025-11-03-incident-multisig-signers/script/UpdateSigners.s.sol
new file mode 100644
index 00000000..b1f7f0b5
--- /dev/null
+++ b/sepolia/2025-11-03-incident-multisig-signers/script/UpdateSigners.s.sol
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
+
+import {Vm} from "forge-std/Vm.sol";
+import {stdJson} from "forge-std/StdJson.sol";
+import {Simulation} from "@base-contracts/script/universal/Simulation.sol";
+import {IMulticall3} from "forge-std/interfaces/IMulticall3.sol";
+
+import {MultisigScript} from "@base-contracts/script/universal/MultisigScript.sol";
+import {GnosisSafe} from "safe-smart-account/GnosisSafe.sol";
+import {OwnerManager} from "safe-smart-account/base/OwnerManager.sol";
+
+contract UpdateSigners is MultisigScript {
+    using stdJson for string;
+
+    address public constant SENTINEL_OWNERS = address(0x1);
+
+    uint256 public constant EXISTING_OWNERS_LENGTH = 14;
+
+    address public immutable OWNER_SAFE;
+    uint256 public immutable THRESHOLD;
+    address[] public EXISTING_OWNERS;
+
+    address[] public OWNERS_TO_ADD;
+    address[] public OWNERS_TO_REMOVE;
+
+    mapping(address => address) public ownerToPrevOwner;
+    mapping(address => address) public ownerToNextOwner;
+    mapping(address => bool) public expectedOwner;
+
+    constructor() {
+        OWNER_SAFE = vm.envAddress("OWNER_SAFE");
+
+        GnosisSafe ownerSafe = GnosisSafe(payable(OWNER_SAFE));
+        THRESHOLD = ownerSafe.getThreshold();
+        EXISTING_OWNERS = ownerSafe.getOwners();
+
+        string memory rootPath = vm.projectRoot();
+        string memory path = string.concat(rootPath, "/OwnerDiff.json");
+        string memory jsonData = vm.readFile(path);
+
+        OWNERS_TO_ADD = abi.decode(jsonData.parseRaw(".OwnersToAdd"), (address[]));
+        OWNERS_TO_REMOVE = abi.decode(jsonData.parseRaw(".OwnersToRemove"), (address[]));
+    }
+
+    function setUp() external {
+        require(OWNERS_TO_ADD.length > 0, "Precheck 00");
+        require(OWNERS_TO_REMOVE.length > 0, "Precheck 01");
+        require(EXISTING_OWNERS.length == EXISTING_OWNERS_LENGTH, "Precheck 02");
+
+        GnosisSafe ownerSafe = GnosisSafe(payable(OWNER_SAFE));
+        address prevOwner = SENTINEL_OWNERS;
+
+        for (uint256 i = OWNERS_TO_ADD.length; i > 0; i--) {
+            uint256 index = i - 1;
+            // Make sure owners to add are not already owners
+            require(!ownerSafe.isOwner(OWNERS_TO_ADD[index]), "Precheck 03");
+            // Prevent duplicates
+            require(!expectedOwner[OWNERS_TO_ADD[index]], "Precheck 04");
+
+            ownerToPrevOwner[OWNERS_TO_ADD[index]] = prevOwner;
+            ownerToNextOwner[prevOwner] = OWNERS_TO_ADD[index];
+            prevOwner = OWNERS_TO_ADD[index];
+            expectedOwner[OWNERS_TO_ADD[index]] = true;
+        }
+
+        for (uint256 i; i < EXISTING_OWNERS.length; i++) {
+            ownerToPrevOwner[EXISTING_OWNERS[i]] = prevOwner;
+            ownerToNextOwner[prevOwner] = EXISTING_OWNERS[i];
+            prevOwner = EXISTING_OWNERS[i];
+            expectedOwner[EXISTING_OWNERS[i]] = true;
+        }
+
+        for (uint256 i; i < OWNERS_TO_REMOVE.length; i++) {
+            // Make sure owners to remove are owners
+            require(ownerSafe.isOwner(OWNERS_TO_REMOVE[i]), "Precheck 05");
+            // Prevent duplicates
+            require(expectedOwner[OWNERS_TO_REMOVE[i]], "Precheck 06");
+            expectedOwner[OWNERS_TO_REMOVE[i]] = false;
+
+            // Remove from linked list to keep ownerToPrevOwner up to date
+            // Note: This works as long as the order of OWNERS_TO_REMOVE does not change during `_buildCalls()`
+            address nextOwner = ownerToNextOwner[OWNERS_TO_REMOVE[i]];
+            address prevPtr = ownerToPrevOwner[OWNERS_TO_REMOVE[i]];
+            ownerToPrevOwner[nextOwner] = prevPtr;
+            ownerToNextOwner[prevPtr] = nextOwner;
+        }
+    }
+
+    function _postCheck(Vm.AccountAccess[] memory, Simulation.Payload memory) internal view override {
+        GnosisSafe ownerSafe = GnosisSafe(payable(OWNER_SAFE));
+        address[] memory postCheckOwners = ownerSafe.getOwners();
+        uint256 postCheckThreshold = ownerSafe.getThreshold();
+
+        uint256 expectedLength = EXISTING_OWNERS.length + OWNERS_TO_ADD.length - OWNERS_TO_REMOVE.length;
+
+        require(postCheckThreshold == THRESHOLD, "Postcheck 00");
+        require(postCheckOwners.length == expectedLength, "Postcheck 01");
+
+        for (uint256 i; i < postCheckOwners.length; i++) {
+            require(expectedOwner[postCheckOwners[i]], "Postcheck 02");
+        }
+    }
+
+    function _buildCalls() internal view override returns (IMulticall3.Call3Value[] memory) {
+        IMulticall3.Call3Value[] memory calls =
+            new IMulticall3.Call3Value[](OWNERS_TO_ADD.length + OWNERS_TO_REMOVE.length);
+
+        for (uint256 i; i < OWNERS_TO_ADD.length; i++) {
+            calls[i] = IMulticall3.Call3Value({
+                target: OWNER_SAFE,
+                allowFailure: false,
+                callData: abi.encodeCall(OwnerManager.addOwnerWithThreshold, (OWNERS_TO_ADD[i], THRESHOLD)),
+                value: 0
+            });
+        }
+
+        for (uint256 i; i < OWNERS_TO_REMOVE.length; i++) {
+            calls[OWNERS_TO_ADD.length + i] = IMulticall3.Call3Value({
+                target: OWNER_SAFE,
+                allowFailure: false,
+                callData: abi.encodeCall(
+                    OwnerManager.removeOwner, (ownerToPrevOwner[OWNERS_TO_REMOVE[i]], OWNERS_TO_REMOVE[i], THRESHOLD)
+                ),
+                value: 0
+            });
+        }
+
+        return calls;
+    }
+
+    function _ownerSafe() internal view override returns (address) {
+        return OWNER_SAFE;
+    }
+}
diff --git a/sepolia/2025-11-03-incident-multisig-signers/validations/base-signer.json b/sepolia/2025-11-03-incident-multisig-signers/validations/base-signer.json
new file mode 100644
index 00000000..d35a20e8
--- /dev/null
+++ b/sepolia/2025-11-03-incident-multisig-signers/validations/base-signer.json
@@ -0,0 +1,121 @@
+{
+  "cmd": "forge script --rpc-url https://ethereum-full-sepolia-k8s-dev.cbhq.net UpdateSigners --sig sign(address[]) [] --sender 0x0CF2F86C3338993ce10F74d6f4B095712c7efe26",
+  "ledgerId": 0,
+  "rpcUrl": "https://ethereum-full-sepolia-k8s-dev.cbhq.net",
+  "expectedDomainAndMessageHashes": {
+    "address": "0x5dfEB066334B67355A15dc9b67317fD2a2e1f77f",
+    "domainHash": "0x0127bbb910536860a0757a9c0ffcdf9e4452220f566ed83af1f27f9e833f0e23",
+    "messageHash": "0xd672c948194b6dcd59f2bd289d5cbe2830861f632e9697d3502b8f4df4a46e2e"
+  },
+  "stateOverrides": [
+    {
+      "name": "CB Signer Safe - Sepolia",
+      "address": "0x5dfeb066334b67355a15dc9b67317fd2a2e1f77f",
+      "overrides": [
+        {
+          "key": "0x0000000000000000000000000000000000000000000000000000000000000004",
+          "value": "0x0000000000000000000000000000000000000000000000000000000000000001",
+          "description": "Override the threshold to 1 so the transaction simulation can occur."
+        },
+        {
+          "key": "0x5184e114a07bb2874fba528601c90cda5eae014b6c6f7d81c92277500bdb0848",
+          "value": "0x0000000000000000000000000000000000000000000000000000000000000001",
+          "description": "Simulates an approval from msg.sender in order for the task simulation to succeed."
+        }
+      ]
+    }
+  ],
+  "stateChanges": [
+    {
+      "name": "CB Signer Safe - Sepolia",
+      "address": "0x5dfeb066334b67355a15dc9b67317fd2a2e1f77f",
+      "changes": [
+        {
+          "key": "0x0000000000000000000000000000000000000000000000000000000000000003",
+          "before": "0x000000000000000000000000000000000000000000000000000000000000000e",
+          "after": "0x000000000000000000000000000000000000000000000000000000000000000d",
+          "description": "Updates the owner count",
+          "allowDifference": false
+        },
+        {
+          "key": "0x0000000000000000000000000000000000000000000000000000000000000004",
+          "before": "0x0000000000000000000000000000000000000000000000000000000000000001",
+          "after": "0x0000000000000000000000000000000000000000000000000000000000000003",
+          "description": "Updates the execution threshold",
+          "allowDifference": false
+        },
+        {
+          "key": "0x0000000000000000000000000000000000000000000000000000000000000005",
+          "before": "0x000000000000000000000000000000000000000000000000000000000000000a",
+          "after": "0x000000000000000000000000000000000000000000000000000000000000000b",
+          "description": "Increments the nonce",
+          "allowDifference": false
+        },
+        {
+          "key": "0x1b89e6111d27169de2f97ec92e344b249dff7dd6170ee65af7a1d9dda6cf7255",
+          "before": "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "after": "0x0000000000000000000000005f1955729e3d6129fb73813e891742d473fc74f7",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xa17f6b5d5c5960e10cb741113b64d7f023e3513339475444585747297bf07208",
+          "before": "0x0000000000000000000000009b43cc2ef6fa521127ade09e20efd6abbc5bf799",
+          "after": "0x000000000000000000000000644d0f5c2c55a4679b4bfe057b87ba203af9ac0d",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xb06fd2848181e1497bbaa80b8d007c335c7806a2e47211a7bba7a9af63e0ca64",
+          "before": "0x000000000000000000000000f2fb17eab635f036da7864b8e39ef8e9a03441df",
+          "after": "0x000000000000000000000000edecf2c444559210a865a22acfc6a2a25590ab1b",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xc5e3baa34a074e15c9dc99b0b81b573ebbdd07b026df6162630478f6d12892f3",
+          "before": "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "after": "0x0000000000000000000000000cf2f86c3338993ce10f74d6f4b095712c7efe26",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xd5a3955556fe832b0d9dee1f7edb84880eee53ea4dc4e838bfa6bebc90480c2a",
+          "before": "0x000000000000000000000000644d0f5c2c55a4679b4bfe057b87ba203af9ac0d",
+          "after": "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xdbe1c9b8b04b880813d25a9c5e89056031fb59c22374b4ee4da23606ff9ee5f5",
+          "before": "0x000000000000000000000000aa2489debf1ef02ab83ba6cde4419e662de9254e",
+          "after": "0x0000000000000000000000000000000000000000000000000000000000000001",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xdf293ebdd99010d44bfef5d86d47c7943a4e69db74a426354dc622e6d4d85761",
+          "before": "0x000000000000000000000000edecf2c444559210a865a22acfc6a2a25590ab1b",
+          "after": "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xe475b9e5509f43031ff937d793c47553513dacb8de5b10e556e7da05bd6d6e54",
+          "before": "0x0000000000000000000000000000000000000000000000000000000000000001",
+          "after": "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "description": "Updates the owners mapping",
+          "allowDifference": false
+        },
+        {
+          "key": "0xe90b7bceb6e7df5418fb78d8ee546e97c83a08bbccc01a0644d599ccd2a7c2e0",
+          "before": "0x0000000000000000000000000cf2f86c3338993ce10f74d6f4b095712c7efe26",
+          "after": "0x0000000000000000000000006e427c3212c0b63be0c382f97715d49b011bff33",
+          "description": "Sets the head of the owners linked list",
+          "allowDifference": false
+        }
+      ]
+    }
+  ],
+  "balanceChanges": []
+}