diff --git a/background/constants/networks.ts b/background/constants/networks.ts
index ee82cffe6..835ad75f9 100644
--- a/background/constants/networks.ts
+++ b/background/constants/networks.ts
@@ -197,10 +197,15 @@ export const NETWORKS_SUPPORTING_SWAPS = new Set(
 )
 
 export const ALCHEMY_SUPPORTED_CHAIN_IDS = new Set(
-  // TODO: Add `ARBITRUM_SEPOLIA` once Alchemy creates a dedicated  RPC.
-  [ETHEREUM, POLYGON, ARBITRUM_ONE, OPTIMISM, GOERLI, SEPOLIA].map(
-    (network) => network.chainID,
-  ),
+  [
+    ETHEREUM,
+    POLYGON,
+    ARBITRUM_ONE,
+    OPTIMISM,
+    GOERLI,
+    SEPOLIA,
+    ARBITRUM_SEPOLIA,
+  ].map((network) => network.chainID),
 )
 
 export const FLASHBOTS_SUPPORTED_CHAIN_IDS = new Set([ETHEREUM.chainID])
diff --git a/background/services/chain/taho-provider.ts b/background/services/chain/taho-provider.ts
index 89fda17b1..0cb392af7 100644
--- a/background/services/chain/taho-provider.ts
+++ b/background/services/chain/taho-provider.ts
@@ -20,10 +20,13 @@ import { ConnectionInfo } from "@ethersproject/web"
 export default class TahoAlchemyProvider extends AlchemyProvider {
   static override getUrl(network: Network, apiKey: string): ConnectionInfo {
     let host = null
-    switch (network.name) {
-      case "sepolia":
+    switch (network.chainId) {
+      case 11155111: // Ethereum Sepolia
         host = "eth-sepolia.g.alchemy.com/v2/"
         break
+      case 421614: // Arbitrum Sepolia
+        host = "arb-sepolia.g.alchemy.com/v2/"
+        break
       default:
         return AlchemyProvider.getUrl(network, apiKey)
     }