diff --git a/packages/sdk/test-next/failedMessages.spec.ts b/packages/sdk/test-next/failedMessages.spec.ts
index d1fa238958299..a02d3c5ae8f5f 100644
--- a/packages/sdk/test-next/failedMessages.spec.ts
+++ b/packages/sdk/test-next/failedMessages.spec.ts
@@ -59,8 +59,8 @@ const sepoliaWallet = new ethers.Wallet(E2E_PRIVATE_KEY, sepoliaProvider)
 const crossChainMessenger = new CrossChainMessenger({
   l1SignerOrProvider: sepoliaWallet,
   l2SignerOrProvider: opSepoliaProvider,
-  l1ChainId: 5,
-  l2ChainId: 420,
+  l1ChainId: 11155111,
+  l2ChainId: 11155420,
   bedrock: true,
 })