diff --git a/hardhat.config.ts b/hardhat.config.ts
index 4cb81269..94eaa311 100644
--- a/hardhat.config.ts
+++ b/hardhat.config.ts
@@ -26,6 +26,7 @@ const chainIds = {
   ropsten: 3,
   avalanche: 43114,
   polygon: 137,
+  arbitrum: 42161,
 };
 
 const alchemyApiKey = process.env.ALCHEMY_API_KEY;