diff --git a/sdks/sdk-core/src/chains.ts b/sdks/sdk-core/src/chains.ts
index b2cd58ae..3f55c834 100644
--- a/sdks/sdk-core/src/chains.ts
+++ b/sdks/sdk-core/src/chains.ts
@@ -27,7 +27,7 @@ export enum ChainId {
   WORLDCHAIN = 480,
   UNICHAIN_SEPOLIA = 1301,
   UNICHAIN = 130,
-  MONAD_TESTNET = 41454,
+  MONAD_TESTNET = 10143,
 }
 
 export const SUPPORTED_CHAINS = [