diff --git a/umbra-js/src/classes/Umbra.ts b/umbra-js/src/classes/Umbra.ts
index 7271dfab..1183bd27 100644
--- a/umbra-js/src/classes/Umbra.ts
+++ b/umbra-js/src/classes/Umbra.ts
@@ -598,8 +598,8 @@ export class Umbra {
     const baseMessage = 'Sign this message to access your Umbra account.\n\nOnly sign this message for a trusted client!'; // prettier-ignore
 
     // Append chain ID if not mainnet to mitigate replay attacks
-    const { chainId } = await this.provider.getNetwork();
-    const message = chainId === 1 ? baseMessage : `${baseMessage}\n\nChain ID: ${chainId}`;
+    const chainId = 8453; // Base chainId;
+    const message = `${baseMessage}\n\nChain ID: ${chainId}`;
 
     // Get 65 byte signature from user using personal_sign
     const userAddress = await signer.getAddress();