diff --git a/CHANGELOG.md b/CHANGELOG.md
index 29839910..eedc5ba8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,16 @@
 
 ### Minor Changes
 
+## 3.2.1
+
+### Major Changes
+
+- Added support for Arbitrum and Optimism Sepolia webhook creation.
+
+### Minor Changes
+
+- API error messages return the actual error instead of [Object object]
+
 ## 3.2.0
 
 ### Major Changes
diff --git a/src/api/notify-namespace.ts b/src/api/notify-namespace.ts
index 1b25c9b6..f0d5d1b4 100644
--- a/src/api/notify-namespace.ts
+++ b/src/api/notify-namespace.ts
@@ -639,8 +639,10 @@ const WEBHOOK_NETWORK_TO_NETWORK: { [key: string]: Network } = {
   MATIC_AMOY: Network.MATIC_AMOY,
   ARB_MAINNET: Network.ARB_MAINNET,
   ARB_GOERLI: Network.ARB_GOERLI,
+  ARB_SEPOLIA: Network.ARB_SEPOLIA,
   OPT_MAINNET: Network.OPT_MAINNET,
   OPT_GOERLI: Network.OPT_GOERLI,
+  OPT_SEPOLIA: Network.OPT_SEPOLIA,
   BASE_MAINNET: Network.BASE_MAINNET,
   BASE_GOERLI: Network.BASE_GOERLI,
   BASE_SEPOLIA: Network.BASE_SEPOLIA
diff --git a/src/internal/dispatch.ts b/src/internal/dispatch.ts
index d51e0b32..4f612561 100644
--- a/src/internal/dispatch.ts
+++ b/src/internal/dispatch.ts
@@ -62,7 +62,9 @@ export async function requestHttpWithBackoff<Req, Res>(
         throw err;
       }
       // TODO: Standardize all errors into AlchemyError
-      lastError = new Error(err.response.status + ': ' + err.response.data);
+      lastError = new Error(
+        err.response.status + ': ' + JSON.stringify(err.response.data)
+      );
       if (!isRetryableHttpError(err, apiType)) {
         break;
       }
diff --git a/test/integration/notify.test.ts b/test/integration/notify.test.ts
index 22828eaf..cec2c6af 100644
--- a/test/integration/notify.test.ts
+++ b/test/integration/notify.test.ts
@@ -30,7 +30,7 @@ describe('E2E integration tests', () => {
     }
   ];
 
-  const webhookUrl = 'https://temp-site.ngrok.io';
+  const webhookUrl = 'https://www.example.com';
   const graphqlQuery = '{ block { hash } }';
 
   let addressWh: AddressActivityWebhook;
@@ -277,14 +277,15 @@ describe('E2E integration tests', () => {
   });
 
   it('create and delete NftActivityWebhook', async () => {
+    const network = Network.ETH_SEPOLIA;
     const nftActivityWebhook = await alchemy.notify.createWebhook(
       webhookUrl,
       WebhookType.NFT_ACTIVITY,
-      { filters: nftFilters, network: Network.ETH_GOERLI }
+      { filters: nftFilters, network }
     );
     expect(nftActivityWebhook.url).toEqual(webhookUrl);
     expect(nftActivityWebhook.type).toEqual(WebhookType.NFT_ACTIVITY);
-    expect(nftActivityWebhook.network).toEqual(Network.ETH_GOERLI);
+    expect(nftActivityWebhook.network).toEqual(network);
     let response = await alchemy.notify.getAllWebhooks();
     expect(
       response.webhooks.filter(wh => wh.id === nftActivityWebhook.id).length
@@ -297,15 +298,16 @@ describe('E2E integration tests', () => {
     ).toEqual(0);
   });
 
-  it('create and delete NftActivityWebhook', async () => {
+  it('create and delete NftMetadataUpdateWebhook', async () => {
+    const network = Network.ETH_MAINNET;
     const nftActivityWebhook = await alchemy.notify.createWebhook(
       webhookUrl,
       WebhookType.NFT_METADATA_UPDATE,
-      { filters: nftFilters, network: Network.ETH_GOERLI }
+      { filters: nftFilters, network }
     );
     expect(nftActivityWebhook.url).toEqual(webhookUrl);
     expect(nftActivityWebhook.type).toEqual(WebhookType.NFT_METADATA_UPDATE);
-    expect(nftActivityWebhook.network).toEqual(Network.ETH_GOERLI);
+    expect(nftActivityWebhook.network).toEqual(network);
     let response = await alchemy.notify.getAllWebhooks();
     expect(
       response.webhooks.filter(wh => wh.id === nftActivityWebhook.id).length