diff --git a/src/client.ts b/src/client.ts
index e04925c..2eb034a 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -10,7 +10,7 @@ export class SingleEthereum extends ISingleEthereum {
   public events: ISingleEthereum["events"] = new EventEmitter();
   public engine: ISingleEthereum["engine"];
   public metadata: ISingleEthereum["metadata"];
-  public chainId: number;
+  public chainId: ISingleEthereum["chainId"];
 
   static async init(opts: SingleEthereumTypes.Options) {
     const client = new SingleEthereum(opts);
diff --git a/test/auth.spec.ts b/test/auth.spec.ts
index eeb27dd..25b922c 100644
--- a/test/auth.spec.ts
+++ b/test/auth.spec.ts
@@ -42,7 +42,7 @@ describe("Auth Integration", () => {
       metadata: {} as any,
       name: "dapp",
     });
-    wallet = await SingleEthereum.init({ core, name: "wallet", metadata: {} as any });
+    wallet = await SingleEthereum.init({ core, name: "wallet", metadata: {} as any, chainId: 1 });
     expect(wallet).to.be.exist;
     expect(dapp).to.be.exist;
     expect(core).to.be.exist;
diff --git a/test/sign.spec.ts b/test/sign.spec.ts
index 894ae8f..3fa2b34 100644
--- a/test/sign.spec.ts
+++ b/test/sign.spec.ts
@@ -58,6 +58,7 @@ describe("Sign Integration", () => {
       core,
       name: "wallet",
       metadata: {} as any,
+      chainId: 1,
     });
     await new Promise((resolve) => setTimeout(resolve, 1000));
     expect(wallet).to.be.exist;
@@ -671,6 +672,7 @@ describe("Sign Integration", () => {
       core,
       name: "wallet",
       metadata: {} as any,
+      chainId: 1,
     });
     const expectedError = getSdkError("UNSUPPORTED_CHAINS");
     await Promise.all([
@@ -708,6 +710,7 @@ describe("Sign Integration", () => {
       core,
       name: "wallet",
       metadata: {} as any,
+      chainId: 1,
     });
     const expectedError = getSdkError("UNSUPPORTED_NAMESPACE_KEY");
     await Promise.all([
@@ -745,6 +748,7 @@ describe("Sign Integration", () => {
       core,
       name: "wallet",
       metadata: {} as any,
+      chainId: 1,
     });
     await Promise.all([
       new Promise<void>((resolve) => {