diff --git a/packages/agents/lighthouse/example.http b/packages/agents/lighthouse/example.http
new file mode 100644
index 0000000000..d0ce866495
--- /dev/null
+++ b/packages/agents/lighthouse/example.http
@@ -0,0 +1,10 @@
+@lighthouseUrl = https://lighthouse-prover-subscriber.mainnet.connext.ninja
+
+@adminToken = foo
+
+POST {{lighthouseUrl}}/clear-cache
+Content-Type: application/json
+
+{
+    "adminToken": "{{adminToken}}"
+}
diff --git a/packages/agents/lighthouse/package.json b/packages/agents/lighthouse/package.json
index 7a14727341..90e5e4153b 100644
--- a/packages/agents/lighthouse/package.json
+++ b/packages/agents/lighthouse/package.json
@@ -27,7 +27,7 @@
   "author": "Connext",
   "license": "ISC",
   "dependencies": {
-    "@arbitrum/sdk": "3.1.11",
+    "@arbitrum/sdk": "4.0.1",
     "@connext/nxtp-adapters-database": "workspace:*",
     "@connext/nxtp-adapters-relayer": "workspace:*",
     "@connext/nxtp-adapters-subgraph": "workspace:*",
@@ -35,7 +35,7 @@
     "@connext/nxtp-utils": "workspace:*",
     "@connext/smart-contracts": "workspace:*",
     "@consensys/linea-sdk": "0.1.6",
-    "@eth-optimism/sdk": "3.2.0",
+    "@eth-optimism/sdk": "3.3.2",
     "@mantleio/sdk": "1.0.0",
     "@sinclair/typebox": "0.25.21",
     "@types/aws-lambda": "8.10.110",
diff --git a/packages/agents/lighthouse/src/mockable.ts b/packages/agents/lighthouse/src/mockable.ts
index 95ce39dcaf..82232d94dd 100644
--- a/packages/agents/lighthouse/src/mockable.ts
+++ b/packages/agents/lighthouse/src/mockable.ts
@@ -9,8 +9,8 @@ import { getDeployedRootManagerContract as _getDeployedRootManagerContract } fro
 import { CrossChainMessenger as _OptimismCrossChainMessenger } from "@eth-optimism/sdk";
 import { CrossChainMessenger as _MantleCrossChainMessenger } from "@mantleio/sdk";
 import { sendWithRelayerWithBackup as _sendWithRelayerWithBackup } from "@connext/nxtp-adapters-relayer";
-import { EventFetcher as _EventFetcher, L2TransactionReceipt as _L2TransactionReceipt } from "@arbitrum/sdk";
-import { L1ToL2MessageGasEstimator } from "@arbitrum/sdk/dist/lib/message/L1ToL2MessageGasEstimator";
+import { EventFetcher as _EventFetcher, ChildTransactionReceipt as _ChildTransactionReceipt } from "@arbitrum/sdk";
+import { ParentToChildMessageGasEstimator } from "@arbitrum/sdk/dist/lib/message/ParentToChildMessageGasEstimator";
 import { getBaseFee as _getBaseFee } from "@arbitrum/sdk/dist/lib/utils/lib";
 import { LineaSDK as _LineaSDK } from "@consensys/linea-sdk";
 import {
@@ -42,7 +42,7 @@ export const sendWithRelayerWithBackup = _sendWithRelayerWithBackup;
 
 export const EventFetcher = _EventFetcher;
 
-export const L2TransactionReceipt = _L2TransactionReceipt;
+export const ChildTransactionReceipt = _ChildTransactionReceipt;
 
 export const RollupUserLogic__factory = _RollupUserLogic__factory;
 
@@ -72,8 +72,10 @@ export const getZkSyncWeb3Provider = (url: string): zk.Provider => {
   return new zk.Provider(url);
 };
 
-export const getL1ToL2MessageGasEstimator = (l2Provider: providers.JsonRpcProvider): L1ToL2MessageGasEstimator => {
-  return new L1ToL2MessageGasEstimator(l2Provider);
+export const getParentToChildMessageGasEstimator = (
+  l2Provider: providers.JsonRpcProvider,
+): ParentToChildMessageGasEstimator => {
+  return new ParentToChildMessageGasEstimator(l2Provider);
 };
 
 export const getContract = (address: string, abi: ContractInterface, provider?: providers.JsonRpcProvider) =>
diff --git a/packages/agents/lighthouse/src/tasks/processFromRoot/helpers/arbitrum.ts b/packages/agents/lighthouse/src/tasks/processFromRoot/helpers/arbitrum.ts
index d906caa77a..c2bfdc4dc2 100644
--- a/packages/agents/lighthouse/src/tasks/processFromRoot/helpers/arbitrum.ts
+++ b/packages/agents/lighthouse/src/tasks/processFromRoot/helpers/arbitrum.ts
@@ -1,11 +1,11 @@
 import { createLoggingContext, jsonifyError } from "@connext/nxtp-utils";
 import { BigNumber, BigNumberish, utils } from "ethers";
-import { l2Networks } from "@arbitrum/sdk/dist/lib/dataEntities/networks";
+import { getChildrenForNetwork } from "@arbitrum/sdk";
 import { NodeInterface__factory } from "@arbitrum/sdk/dist/lib/abi/factories/NodeInterface__factory";
 
 import { getContext } from "../processFromRoot";
 import { ConfirmDataDoesNotMatch, NoRootAvailable, RollUpNodeStaked } from "../errors";
-import { EventFetcher, JsonRpcProvider, L2TransactionReceipt, RollupUserLogic__factory } from "../../../mockable";
+import { EventFetcher, JsonRpcProvider, ChildTransactionReceipt, RollupUserLogic__factory } from "../../../mockable";
 import { ArbitrumNodeCreatedEventsNotFound } from "../../../errors";
 
 import { GetProcessArgsParams } from ".";
@@ -37,7 +37,7 @@ export const getProcessFromArbitrumRootArgs = async ({
   // // get the tx
   const spokeJsonProvider = new JsonRpcProvider(spokeProvider);
   const tx = await spokeJsonProvider.getTransactionReceipt(sendHash);
-  const l2TxnReceipt = new L2TransactionReceipt(tx);
+  const l2TxnReceipt = new ChildTransactionReceipt(tx);
   // @ts-ignore
   const dataIsOnL1 = await l2TxnReceipt.isDataAvailable(spokeJsonProvider);
   if (!dataIsOnL1) {
@@ -45,7 +45,7 @@ export const getProcessFromArbitrumRootArgs = async ({
   }
   // get the proof
   const hubJsonProvider = new JsonRpcProvider(hubProvider);
-  const [reader] = await l2TxnReceipt.getL2ToL1Messages(hubJsonProvider);
+  const [reader] = await l2TxnReceipt.getChildToParentMessages(hubJsonProvider);
   const msg = (reader as any).nitroReader;
   if (!msg?.event) {
     throw new Error(`Could not find event for message in ${sendHash}`);
@@ -78,7 +78,7 @@ export const getProcessFromArbitrumRootArgs = async ({
   // 2. (not used) Calculate the send root and the item hash using the `Outbox.sol` interface, then
   //    find the event emitted after the `ethBlockNum` of the message containing a matching
   //    sendRoot. Find the nodeNum from this event, and submit to chain (seen below)
-  const arbNetwork = l2Networks[spokeChainId];
+  const arbNetwork = getChildrenForNetwork(hubChainId).find((n) => n.chainId === spokeChainId)!;
   const latest = await hubJsonProvider.getBlockNumber();
   const fetcher = new EventFetcher(hubJsonProvider);
   logger.info("Fetching events", requestContext, methodContext, {
@@ -105,7 +105,7 @@ export const getProcessFromArbitrumRootArgs = async ({
     const log = logs[mid];
     let sendCount = BigNumber.from(msg.event.position as BigNumberish);
     try {
-      const block = await msg.getBlockFromNodeLog(spokeJsonProvider, log);
+      const block = await msg.getBlockFromAssertionLog(spokeJsonProvider, log);
       sendCount = BigNumber.from(block.sendCount);
     } catch (e: unknown) {
       logger.warn("Failed to get block from node log", requestContext, methodContext, {
@@ -116,6 +116,7 @@ export const getProcessFromArbitrumRootArgs = async ({
     if (sendCount.gt(msg.event.position as BigNumberish)) {
       foundLog = log;
       right = mid - 1;
+      left = right + 1;
     } else {
       left = mid + 1;
     }
@@ -123,7 +124,7 @@ export const getProcessFromArbitrumRootArgs = async ({
 
   const earliestNodeWithExit = foundLog.event.nodeNum;
   const rollup = RollupUserLogic__factory.getContract(arbNetwork.ethBridge.rollup, RollupUserLogic__factory.abi);
-  const foundBlock = await msg.getBlockFromNodeNum(
+  const foundBlock = await msg.getBlockFromAssertionId(
     rollup.connect(hubJsonProvider),
     earliestNodeWithExit,
     spokeJsonProvider,
diff --git a/packages/agents/lighthouse/src/tasks/propagate/helpers/arbitrum.ts b/packages/agents/lighthouse/src/tasks/propagate/helpers/arbitrum.ts
index b1215d96c4..5866c37e8d 100644
--- a/packages/agents/lighthouse/src/tasks/propagate/helpers/arbitrum.ts
+++ b/packages/agents/lighthouse/src/tasks/propagate/helpers/arbitrum.ts
@@ -6,7 +6,7 @@ import { NoSpokeConnector, NoHubConnector, NoProviderForDomain } from "../errors
 import { ExtraPropagateParam } from "../operations/propagate";
 import {
   getJsonRpcProvider,
-  getL1ToL2MessageGasEstimator,
+  getParentToChildMessageGasEstimator,
   getBaseFee,
   getInterface,
   getBestProvider,
@@ -62,7 +62,7 @@ export const getPropagateParams = async (
 
   try {
     const l2Provider = getJsonRpcProvider(l2RpcUrl);
-    const l1ToL2MessageGasEstimate = getL1ToL2MessageGasEstimator(l2Provider);
+    const l1ToL2MessageGasEstimate = getParentToChildMessageGasEstimator(l2Provider);
 
     // example encoded payload: 0x4ff746f6000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000207465737400000000000000000000000000000000000000000000000000000000
     // length = 200 not including 0x = 100 bytes
diff --git a/packages/agents/lighthouse/test/tasks/processFromRoot/helpers/arbitrum.spec.ts b/packages/agents/lighthouse/test/tasks/processFromRoot/helpers/arbitrum.spec.ts
index 64182017e7..5f0626d7ea 100644
--- a/packages/agents/lighthouse/test/tasks/processFromRoot/helpers/arbitrum.spec.ts
+++ b/packages/agents/lighthouse/test/tasks/processFromRoot/helpers/arbitrum.spec.ts
@@ -1,6 +1,6 @@
 import { Logger, createRequestContext, expect, mkHash } from "@connext/nxtp-utils";
 import { stub, SinonStub, createStubInstance, SinonStubbedInstance, spy } from "sinon";
-import { L2ToL1MessageReader } from "@arbitrum/sdk";
+import { ChildToParentMessageReader } from "@arbitrum/sdk";
 import { NodeInterface__factory } from "@arbitrum/sdk/dist/lib/abi/factories/NodeInterface__factory";
 
 import * as MockableFns from "../../../../src/mockable";
@@ -20,14 +20,14 @@ class MockJsonRpcProvider {
 }
 
 let isDataAvailableStub: SinonStub<any[], any>;
-let l2ToL1MessageReader: SinonStubbedInstance<L2ToL1MessageReader>;
+let l2ToL1MessageReader: SinonStubbedInstance<ChildToParentMessageReader>;
 class MockL2TransactionReceipt {
   public isDataAvailable = isDataAvailableStub;
-  public getL2ToL1Messages = stub().resolves([l2ToL1MessageReader]);
+  public getChildToParentMessages = stub().resolves([l2ToL1MessageReader]);
 }
 class MockL2TransactionReceiptTemp {
   public isDataAvailable = isDataAvailableStub;
-  public getL2ToL1Messages = stub().resolves([{}]);
+  public getChildToParentMessages = stub().resolves([{}]);
 }
 
 class MockEventFetcher {
@@ -49,11 +49,11 @@ describe("Helpers: Arbitrum", () => {
   let confirmData: SinonStub<any[], any>;
   beforeEach(() => {
     isDataAvailableStub = stub().resolves(true);
-    l2ToL1MessageReader = createStubInstance(L2ToL1MessageReader, {
+    l2ToL1MessageReader = createStubInstance(ChildToParentMessageReader, {
       getOutboxProof: Promise.resolve(["hello", "world"]),
     } as any);
     (l2ToL1MessageReader as any).nitroReader = {
-      getBlockFromNodeNum: (...args: any) =>
+      getBlockFromAssertionId: (...args: any) =>
         Promise.resolve({
           blockNumber: constants.One,
           nodeNum: constants.One,
@@ -61,7 +61,7 @@ describe("Helpers: Arbitrum", () => {
           sendCount: constants.One,
           hash: mkHash("0x456"),
         } as any),
-      getBlockFromNodeLog: (...args: any) =>
+      getBlockFromAssertionLog: (...args: any) =>
         Promise.resolve({
           blockNumber: constants.One,
           nodeNum: constants.One,
@@ -71,7 +71,7 @@ describe("Helpers: Arbitrum", () => {
         } as any),
       event: { position: constants.One, ethBlockNum: constants.One },
     };
-    stub(MockableFns, "L2TransactionReceipt").value(MockL2TransactionReceipt);
+    stub(MockableFns, "ChildTransactionReceipt").value(MockL2TransactionReceipt);
     stub(MockableFns, "JsonRpcProvider").value(MockJsonRpcProvider);
     stub(MockableFns, "EventFetcher").value(MockEventFetcher);
     stub(MockableFns, "Outbox__factory").value(mockOutboxFactory);
@@ -101,6 +101,7 @@ describe("Helpers: Arbitrum", () => {
     isDataAvailableStub.resolves(false);
     await expect(
       getProcessFromArbitrumRootArgs({
+        isSpokeClaim: false,
         spokeChainId: 42161,
         spokeDomainId: "1",
         spokeProvider: "world",
@@ -119,6 +120,7 @@ describe("Helpers: Arbitrum", () => {
     confirmData.returns([{ confirmData: "0xfoo" }]);
     await expect(
       getProcessFromArbitrumRootArgs({
+        isSpokeClaim: false,
         spokeChainId: 42161,
         spokeDomainId: "1",
         spokeProvider: "world",
@@ -143,6 +145,7 @@ describe("Helpers: Arbitrum", () => {
     ]);
     await expect(
       getProcessFromArbitrumRootArgs({
+        isSpokeClaim: false,
         spokeChainId: 42161,
         spokeDomainId: "1",
         spokeProvider: "world",
@@ -167,6 +170,7 @@ describe("Helpers: Arbitrum", () => {
     ]);
     await expect(
       getProcessFromArbitrumRootArgs({
+        isSpokeClaim: false,
         spokeChainId: 42161,
         spokeDomainId: "1",
         spokeProvider: "world",
@@ -182,9 +186,10 @@ describe("Helpers: Arbitrum", () => {
   });
 
   it("should throw error in case msg event is not present", async () => {
-    stub(MockableFns, "L2TransactionReceipt").value(MockL2TransactionReceiptTemp);
+    stub(MockableFns, "ChildTransactionReceipt").value(MockL2TransactionReceiptTemp);
     await expect(
       getProcessFromArbitrumRootArgs({
+        isSpokeClaim: false,
         spokeChainId: 42161,
         spokeDomainId: "1",
         spokeProvider: "world",
@@ -201,6 +206,7 @@ describe("Helpers: Arbitrum", () => {
 
   it("should work", async () => {
     const args = await getProcessFromArbitrumRootArgs({
+      isSpokeClaim: false,
       spokeChainId: 42161,
       spokeDomainId: "1",
       spokeProvider: "world",
@@ -219,6 +225,7 @@ describe("Helpers: Arbitrum", () => {
     stub(MockableFns, "EventFetcher").value(MockEventFetcherError);
     await expect(
       getProcessFromArbitrumRootArgs({
+        isSpokeClaim: false,
         spokeChainId: 42161,
         spokeDomainId: "1",
         spokeProvider: "world",
@@ -235,7 +242,7 @@ describe("Helpers: Arbitrum", () => {
 
   it("should have warning in getBlockFromNodeLog fails", async () => {
     (l2ToL1MessageReader as any).nitroReader = {
-      getBlockFromNodeNum: (...args: any) =>
+      getBlockFromAssertionId: (...args: any) =>
         Promise.resolve({
           blockNumber: constants.One,
           nodeNum: constants.One,
@@ -243,7 +250,7 @@ describe("Helpers: Arbitrum", () => {
           sendCount: constants.One,
           hash: mkHash("0x456"),
         } as any),
-      getBlockFromNodeLog: (...args: any) =>
+      getBlockFromAssertionLog: (...args: any) =>
         Promise.reject({
           blockNumber: constants.One,
           nodeNum: constants.One,
@@ -256,6 +263,7 @@ describe("Helpers: Arbitrum", () => {
     const loggerSpy = spy(getContext().logger, "warn");
 
     const args = await getProcessFromArbitrumRootArgs({
+      isSpokeClaim: false,
       spokeChainId: 42161,
       spokeDomainId: "1",
       spokeProvider: "world",
diff --git a/packages/agents/lighthouse/test/tasks/propagate/helpers/arbitrum.spec.ts b/packages/agents/lighthouse/test/tasks/propagate/helpers/arbitrum.spec.ts
index 28c2a099d6..3456925ba4 100644
--- a/packages/agents/lighthouse/test/tasks/propagate/helpers/arbitrum.spec.ts
+++ b/packages/agents/lighthouse/test/tasks/propagate/helpers/arbitrum.spec.ts
@@ -7,19 +7,22 @@ import * as Mockable from "../../../../src/mockable";
 import { getPropagateParams } from "../../../../src/tasks/propagate/helpers/arbitrum";
 import { getInterfaceMock, propagateCtxMock, getBestProviderMock } from "../../../globalTestHook";
 import { mock } from "../../../mock";
-import { L1ToL2MessageGasEstimator } from "@arbitrum/sdk";
+import { ParentToChildMessageGasEstimator } from "@arbitrum/sdk";
 
 const requestContext = createRequestContext("test");
 
 const estimateSubmissionFee = Promise.resolve(constants.One);
 const estimateRetryableTicketGasLimit = Promise.resolve(constants.Two);
-let l1ToL2: SinonStubbedInstance<L1ToL2MessageGasEstimator>;
+let l1ToL2: SinonStubbedInstance<ParentToChildMessageGasEstimator>;
 
 describe("Helpers: Arbitrum ", () => {
   beforeEach(() => {
-    l1ToL2 = createStubInstance(L1ToL2MessageGasEstimator, { estimateSubmissionFee, estimateRetryableTicketGasLimit });
+    l1ToL2 = createStubInstance(ParentToChildMessageGasEstimator, {
+      estimateSubmissionFee,
+      estimateRetryableTicketGasLimit,
+    });
     stub(Mockable, "getJsonRpcProvider").returns(createStubInstance(providers.JsonRpcProvider));
-    stub(Mockable, "getL1ToL2MessageGasEstimator").returns(l1ToL2);
+    stub(Mockable, "getParentToChildMessageGasEstimator").returns(l1ToL2);
     stub(Mockable, "getBaseFee").resolves(BigNumber.from(1));
     getInterfaceMock.returns({ encodeFunctionData: stub().resolves(mkBytes32("0xcalldadta")) });
   });
diff --git a/packages/deployments/contracts/package.json b/packages/deployments/contracts/package.json
index 61c958e88f..0cef63ee83 100644
--- a/packages/deployments/contracts/package.json
+++ b/packages/deployments/contracts/package.json
@@ -51,10 +51,10 @@
   "author": "Connext",
   "license": "ISC",
   "dependencies": {
-    "@eth-optimism/sdk": "3.2.0"
+    "@eth-optimism/sdk": "3.3.2"
   },
   "devDependencies": {
-    "@arbitrum/sdk": "3.1.11",
+    "@arbitrum/sdk": "4.0.1",
     "@certusone/wormhole-sdk": "0.9.21",
     "@connext/nxtp-utils": "workspace:*",
     "@consensys/linea-sdk": "0.1.6",
diff --git a/packages/deployments/contracts/src/cli/op-mode/switchMode.ts b/packages/deployments/contracts/src/cli/op-mode/switchMode.ts
index da1510b283..255b25494d 100644
--- a/packages/deployments/contracts/src/cli/op-mode/switchMode.ts
+++ b/packages/deployments/contracts/src/cli/op-mode/switchMode.ts
@@ -1,6 +1,6 @@
 import commandLineArgs from "command-line-args";
 
-import { Wallet } from "ethers";
+import { Contract, Wallet } from "ethers";
 import { Env, getProviderFromHardhatConfig } from "../..";
 import { SUPPORTED_DOMAINS, HUBS, updateIfNeeded } from "../helpers";
 import {
@@ -107,6 +107,17 @@ export const switchMode = async () => {
 
     // Update SpokeConnector
     console.log(`\tUpdating SpokeConnector (${deployments.SpokeConnector.address})...`);
+    const owner = await deployments.SpokeConnector.contract.owner();
+    const contract = new Contract(
+      owner,
+      ["function getThreshold() view returns (uint256)"],
+      deployments.SpokeConnector.contract.provider,
+    );
+    let threshold = "N/A";
+    try {
+      threshold = await contract.getThreshold();
+    } catch (e) {}
+    console.log(`\t\tOwner: ${owner}, threshold: ${threshold}`);
     await updateIfNeeded(
       optimistic
         ? {
diff --git a/packages/deployments/contracts/tasks/connector/processFromRoot.ts b/packages/deployments/contracts/tasks/connector/processFromRoot.ts
index 78fcd94eee..8dfdd5ac46 100644
--- a/packages/deployments/contracts/tasks/connector/processFromRoot.ts
+++ b/packages/deployments/contracts/tasks/connector/processFromRoot.ts
@@ -1,8 +1,8 @@
 import { task } from "hardhat/config";
-import { EventFetcher, L2TransactionReceipt } from "@arbitrum/sdk";
+import { EventFetcher, ChildTransactionReceipt, getChildrenForNetwork } from "@arbitrum/sdk";
+
 import { BigNumber, BigNumberish, constants, Contract, providers, Wallet } from "ethers";
 import { defaultAbiCoder, keccak256 } from "ethers/lib/utils";
-import { l2Networks } from "@arbitrum/sdk/dist/lib/dataEntities/networks";
 import {
   DEFAULT_L2_CONTRACT_ADDRESSES,
   CrossChainMessenger as OptimismCrossChainMessenger,
@@ -53,7 +53,7 @@ const processFromPolygonRoot = async (spoke: number, sendHash: string, hubProvid
     SEND_MESSAGE_EVENT_SIG,
     providerMapping,
   );
-  if (!hash || !payload) {
+  if (!payload) {
     throw new Error(`no hash or payload. already or not yet ready to be processed`);
   }
   console.log("hash: ", hash);
@@ -75,16 +75,16 @@ const processFromArbitrumRoot = async (
   // // uint256 _index, x
   // // L2Message calldata _message x
   // // get the tx
-  const l2TxnReceipt = new L2TransactionReceipt(await spokeProvider.getTransactionReceipt(sendHash));
+  const l2TxnReceipt = new ChildTransactionReceipt(await spokeProvider.getTransactionReceipt(sendHash));
   // @ts-ignore
   const dataIsOnL1 = await l2TxnReceipt.isDataAvailable(spokeProvider);
   if (!dataIsOnL1) {
     throw new Error(`tx data not yet posted to l1`);
   }
   // get the proof
-  const [reader] = await l2TxnReceipt.getL2ToL1Messages(hubProvider);
+  const [reader] = await l2TxnReceipt.getChildToParentMessages(hubProvider);
   console.log("msg:", (reader as any).nitroReader.event);
-  const msg = (reader as any).nitroReader;
+  const msg = (reader as any).nitroReader; //as nitro.ChildToParentMessageReaderNitro;
   if (!msg?.event) {
     throw new Error(`Could not find event for message in ${sendHash}`);
   }
@@ -115,13 +115,17 @@ const processFromArbitrumRoot = async (
   // 2. Calculate the send root and the item hash using the `Outbox.sol` interface, then
   //    find the event emitted after the `ethBlockNum` of the message containing a matching
   //    sendRoot. Find the nodeNum from this event, and submit to chain. Not used.
-  const arbNetwork = l2Networks[spoke];
+  const arbNetwork = getChildrenForNetwork(1).find((n) => n.chainId === spoke);
+  if (!arbNetwork) {
+    throw new Error(`could not find arbitrum child network for spoke ${spoke}`);
+  }
   const fetcher = new EventFetcher(hubProvider);
   console.log("searching for node created events at", arbNetwork.ethBridge.rollup);
   const logs = await fetcher.getEvents(RollupUserLogic__factory, (t) => t.filters.NodeCreated(), {
     fromBlock: msg.event.ethBlockNum.toNumber(),
     toBlock: "latest",
   });
+  console.log("found", logs.length, "logs to sort through. searching for send count >", msg.event.position.toString());
   // use binary search to find the first node with sendCount > this.event.position
   // default to the last node since we already checked above
   let foundLog: FetchedEvent<NodeCreatedEvent> = logs[logs.length - 1];
@@ -130,11 +134,18 @@ const processFromArbitrumRoot = async (
   while (left <= right) {
     const mid = Math.floor((left + right) / 2);
     const log = logs[mid];
-    const block = await msg.getBlockFromNodeLog(spokeProvider, log);
-    const sendCount = BigNumber.from(block.sendCount);
+    let sendCount = BigNumber.from(0);
+    try {
+      const block = await msg.getBlockFromAssertionLog(spokeProvider, log);
+      sendCount = BigNumber.from(block.sendCount);
+    } catch (e) {
+      console.warn("failed to get block:", e);
+    }
+    console.log("- sendCount", sendCount.toString());
     if (sendCount.gt(msg.event.position as BigNumberish)) {
       foundLog = log;
       right = mid - 1;
+      left = right + 1;
     } else {
       left = mid + 1;
     }
@@ -146,7 +157,7 @@ const processFromArbitrumRoot = async (
     RollupUserLogic__factory.abi,
     deployer.connect(hubProvider),
   );
-  const foundBlock = await msg.getBlockFromNodeNum(rollup, earliestNodeWithExit, spokeProvider);
+  const foundBlock = await msg.getBlockFromAssertionId(rollup, earliestNodeWithExit, spokeProvider);
   console.log("node:", earliestNodeWithExit.toString());
   console.log("msg.position", msg.event.position.toString());
   console.log("foundLog:", foundLog);
@@ -324,7 +335,7 @@ export default task("process-from-root", "Call `Connector.processFromRoot()` to
   .addOptionalParam("networkType", "Type of network of contracts")
   .setAction(
     async ({ env: _env, tx: sendHash, spoke: _spoke, networkType: _networkType }: TaskArgs, { deployments }) => {
-      const deployer = Wallet.fromMnemonic(process.env.MAINNET_MNEMONIC!);
+      const deployer = Wallet.fromMnemonic(process.env.MAINNET_MNEMONIC ?? process.env.MNEMONIC!);
 
       const env = mustGetEnv(_env);
       const spoke = +_spoke;
@@ -354,6 +365,7 @@ export default task("process-from-root", "Call `Connector.processFromRoot()` to
           args = await processFromOptimismRoot(spoke, sendHash, protocolConfig, l2Provider, l1Provider);
           break;
         case "Arbitrum":
+          method = "processMessageFromRoot";
           args = await processFromArbitrumRoot(spoke, sendHash, l2Provider, l1Provider, deployer);
           break;
         case "Polygon":
diff --git a/packages/deployments/contracts/tasks/connector/redeem.ts b/packages/deployments/contracts/tasks/connector/redeem.ts
index dbe6c0f785..79034af550 100644
--- a/packages/deployments/contracts/tasks/connector/redeem.ts
+++ b/packages/deployments/contracts/tasks/connector/redeem.ts
@@ -1,4 +1,4 @@
-import { L1ToL2MessageStatus, L1TransactionReceipt } from "@arbitrum/sdk";
+import { ParentToChildMessageStatus, ParentTransactionReceipt } from "@arbitrum/sdk";
 import { providers, Wallet } from "ethers";
 import { task } from "hardhat/config";
 
@@ -26,16 +26,16 @@ const redeemFromArbitrum = async (
   spokeProvider: providers.JsonRpcProvider,
 ) => {
   // Get the message receipt from arbitrum sdk
-  const receipt = new L1TransactionReceipt(await hubProvider.getTransactionReceipt(hash));
+  const receipt = new ParentTransactionReceipt(await hubProvider.getTransactionReceipt(hash));
   console.log("got l1 -> l2 message receipt on l1", receipt.transactionHash);
 
   // get the mesesage (assume only one arb message in receipt)
-  const [message] = await receipt.getL1ToL2Messages(signer.connect(spokeProvider));
+  const [message] = await receipt.getParentToChildMessages(signer.connect(spokeProvider));
   const { status } = await message.waitForStatus();
   console.log("got l1 -> l2 message", message);
 
   // check to see if it needs redemption
-  if (status != L1ToL2MessageStatus.FUNDS_DEPOSITED_ON_L2) {
+  if (status != ParentToChildMessageStatus.FUNDS_DEPOSITED_ON_CHILD) {
     throw new Error(`Not ready to redeem, or was auto-redeemed. Status: ${status}`);
   }
 
diff --git a/packages/utils/src/maticjs/error.ts b/packages/utils/src/maticjs/error.ts
index 90d4f2cd23..0a68c906c6 100644
--- a/packages/utils/src/maticjs/error.ts
+++ b/packages/utils/src/maticjs/error.ts
@@ -4,6 +4,7 @@ export enum MaticJsErrorType {
   BlockNotIncluded = "no_block_found",
   IncorrectTx = "incorrect_transaction",
   TxNotCheckpointed = "transaction_not_checkpointed",
+  NoExitHash = "no_exit_hash",
 }
 
 // custom errors for better error handling
diff --git a/packages/utils/src/maticjs/proof.ts b/packages/utils/src/maticjs/proof.ts
index c7698bbbd3..a8cbbd604f 100644
--- a/packages/utils/src/maticjs/proof.ts
+++ b/packages/utils/src/maticjs/proof.ts
@@ -64,7 +64,7 @@ export const generateExitPayload = async (
       try {
         exitHash = await maticClient.exitUtil.getExitHash(burnTxHash, 0, eventSignature);
       } catch (error: any) {
-        throw new InfoError(MaticJsErrorType.TxNotCheckpointed, "Burn transaction has not been checkpointed yet");
+        throw new InfoError(MaticJsErrorType.NoExitHash, "Could not retrieve the exit hash");
       }
 
       // build payload for exit
diff --git a/yarn.lock b/yarn.lock
index 47f35db495..159984c4eb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -70,15 +70,16 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@arbitrum/sdk@npm:3.1.11":
-  version: 3.1.11
-  resolution: "@arbitrum/sdk@npm:3.1.11"
+"@arbitrum/sdk@npm:4.0.1":
+  version: 4.0.1
+  resolution: "@arbitrum/sdk@npm:4.0.1"
   dependencies:
     "@ethersproject/address": ^5.0.8
     "@ethersproject/bignumber": ^5.1.1
     "@ethersproject/bytes": ^5.0.8
+    async-mutex: ^0.4.0
     ethers: ^5.1.0
-  checksum: 79066b07d685755c53f4d7a2862f84c189ab07207d7c4cf8909b540cfbeb07007fec5d7cb9057c2c01df4ee196653cdbe17674bf80eb45bf2fb64f07b8d5f6a2
+  checksum: 7404c019563538c078f24b9f965d99ca5080435cd681628ac0f7aef2f7777806ec10ffcb3b31ccb9b44d951572ed219cfc1bde8f5a3f0878b7cbd9af4b4b334d
   languageName: node
   linkType: hard
 
@@ -2428,7 +2429,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@connext/lighthouse@workspace:packages/agents/lighthouse"
   dependencies:
-    "@arbitrum/sdk": 3.1.11
+    "@arbitrum/sdk": 4.0.1
     "@connext/nxtp-adapters-database": "workspace:*"
     "@connext/nxtp-adapters-relayer": "workspace:*"
     "@connext/nxtp-adapters-subgraph": "workspace:*"
@@ -2436,7 +2437,7 @@ __metadata:
     "@connext/nxtp-utils": "workspace:*"
     "@connext/smart-contracts": "workspace:*"
     "@consensys/linea-sdk": 0.1.6
-    "@eth-optimism/sdk": 3.2.0
+    "@eth-optimism/sdk": 3.3.2
     "@graphql-codegen/cli": 3.0.0
     "@mantleio/sdk": 1.0.0
     "@sinclair/typebox": 0.25.21
@@ -2946,11 +2947,11 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@connext/smart-contracts@workspace:packages/deployments/contracts"
   dependencies:
-    "@arbitrum/sdk": 3.1.11
+    "@arbitrum/sdk": 4.0.1
     "@certusone/wormhole-sdk": 0.9.21
     "@connext/nxtp-utils": "workspace:*"
     "@consensys/linea-sdk": 0.1.6
-    "@eth-optimism/sdk": 3.2.0
+    "@eth-optimism/sdk": 3.3.2
     "@gelatonetwork/relay-context": 2.1.0
     "@mantleio/sdk": 1.0.0
     "@matterlabs/hardhat-zksync-deploy": 0.6.3
@@ -3465,13 +3466,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@eth-optimism/contracts-bedrock@npm:0.17.1":
-  version: 0.17.1
-  resolution: "@eth-optimism/contracts-bedrock@npm:0.17.1"
-  checksum: ae75458ca843dc36d050a484a97226112d1c5a1453cb8a59a1a64e4805052984663b2d83ca1a2764751ea182e09ee53ddc1ab19c6a94885a6e743371498060a2
-  languageName: node
-  linkType: hard
-
 "@eth-optimism/contracts@npm:0.6.0":
   version: 0.6.0
   resolution: "@eth-optimism/contracts@npm:0.6.0"
@@ -3509,9 +3503,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@eth-optimism/core-utils@npm:0.13.1":
-  version: 0.13.1
-  resolution: "@eth-optimism/core-utils@npm:0.13.1"
+"@eth-optimism/core-utils@npm:^0.13.2":
+  version: 0.13.2
+  resolution: "@eth-optimism/core-utils@npm:0.13.2"
   dependencies:
     "@ethersproject/abi": ^5.7.0
     "@ethersproject/abstract-provider": ^5.7.0
@@ -3524,27 +3518,26 @@ __metadata:
     "@ethersproject/properties": ^5.7.0
     "@ethersproject/rlp": ^5.7.0
     "@ethersproject/web": ^5.7.1
-    chai: ^4.3.9
+    chai: ^4.3.10
     ethers: ^5.7.2
     node-fetch: ^2.6.7
-  checksum: ed1f1bcec4fd308463c6bd6e6cc8f6c89041dfa5e0c03c67ee487f5b3bef7bb34c59ea1f8039d00cc0e8696ed8ae9a4486c10d86b2db1d9dadb94294fc83b6fc
+  checksum: 4603b4a43b06d4b8117bdfa8175709a7ff8c708d7b439c16997c590fed976ee3b2989362b47aad4ffdbce0c1f9b8f86140d308e55fa553d2daaae1ba054ae927
   languageName: node
   linkType: hard
 
-"@eth-optimism/sdk@npm:3.2.0":
-  version: 3.2.0
-  resolution: "@eth-optimism/sdk@npm:3.2.0"
+"@eth-optimism/sdk@npm:3.3.2":
+  version: 3.3.2
+  resolution: "@eth-optimism/sdk@npm:3.3.2"
   dependencies:
     "@eth-optimism/contracts": 0.6.0
-    "@eth-optimism/contracts-bedrock": 0.17.1
-    "@eth-optimism/core-utils": 0.13.1
+    "@eth-optimism/core-utils": ^0.13.2
     lodash: ^4.17.21
     merkletreejs: ^0.3.11
     rlp: ^2.2.7
-    semver: ^7.5.4
+    semver: ^7.6.0
   peerDependencies:
     ethers: ^5
-  checksum: e8101a3d9c3dde9f02bc0862aa1afe68235505976b27e1ea1bcb4524d4fd9531fdb66dcbb841ff3f8b38fd9110a51260f38a434532d72b6857710c1d76a1d2a4
+  checksum: d24707c9540a5e9c7f4a123e7dd085ebd4cfa861ffce3fb124bd3c7c92da5d7c92ddf488582cfc3cda17bde010cfda5812c183750ae9cd0ebae913328eae47c2
   languageName: node
   linkType: hard
 
@@ -10739,6 +10732,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"async-mutex@npm:^0.4.0":
+  version: 0.4.1
+  resolution: "async-mutex@npm:0.4.1"
+  dependencies:
+    tslib: ^2.4.0
+  checksum: cb529c0d257c8ff8e5b26c81b36127a255e545edee2c42c76247d533b89a7664037d95f33130f964de49b111ad3324ead8dcccd419c47acdfeb7413ed93063a1
+  languageName: node
+  linkType: hard
+
 "async-retry@npm:^1.3.1":
   version: 1.3.3
   resolution: "async-retry@npm:1.3.3"
@@ -12876,7 +12878,22 @@ __metadata:
   languageName: node
   linkType: hard
 
-"chai@npm:^4.3.4, chai@npm:^4.3.9":
+"chai@npm:^4.3.10":
+  version: 4.5.0
+  resolution: "chai@npm:4.5.0"
+  dependencies:
+    assertion-error: ^1.1.0
+    check-error: ^1.0.3
+    deep-eql: ^4.1.3
+    get-func-name: ^2.0.2
+    loupe: ^2.3.6
+    pathval: ^1.1.1
+    type-detect: ^4.1.0
+  checksum: 70e5a8418a39e577e66a441cc0ce4f71fd551a650a71de30dd4e3e31e75ed1f5aa7119cf4baf4a2cb5e85c0c6befdb4d8a05811fad8738c1a6f3aa6a23803821
+  languageName: node
+  linkType: hard
+
+"chai@npm:^4.3.4":
   version: 4.4.1
   resolution: "chai@npm:4.4.1"
   dependencies:
@@ -28141,7 +28158,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"semver@npm:^7.3.4, semver@npm:^7.3.5, semver@npm:^7.3.7, semver@npm:^7.3.8, semver@npm:^7.5.3, semver@npm:^7.5.4":
+"semver@npm:^7.3.4, semver@npm:^7.3.5, semver@npm:^7.3.7, semver@npm:^7.3.8, semver@npm:^7.5.3":
   version: 7.6.0
   resolution: "semver@npm:7.6.0"
   dependencies:
@@ -28152,6 +28169,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"semver@npm:^7.6.0":
+  version: 7.6.3
+  resolution: "semver@npm:7.6.3"
+  bin:
+    semver: bin/semver.js
+  checksum: 4110ec5d015c9438f322257b1c51fe30276e5f766a3f64c09edd1d7ea7118ecbc3f379f3b69032bacf13116dc7abc4ad8ce0d7e2bd642e26b0d271b56b61a7d8
+  languageName: node
+  linkType: hard
+
 "semver@npm:~5.4.1":
   version: 5.4.1
   resolution: "semver@npm:5.4.1"
@@ -30735,6 +30761,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"type-detect@npm:^4.1.0":
+  version: 4.1.0
+  resolution: "type-detect@npm:4.1.0"
+  checksum: 3b32f873cd02bc7001b00a61502b7ddc4b49278aabe68d652f732e1b5d768c072de0bc734b427abf59d0520a5f19a2e07309ab921ef02018fa1cb4af155cdb37
+  languageName: node
+  linkType: hard
+
 "type-fest@npm:^0.18.0":
   version: 0.18.1
   resolution: "type-fest@npm:0.18.1"