diff --git a/packages/sdk/package.json b/packages/sdk/package.json
index eff6ee1..b841827 100644
--- a/packages/sdk/package.json
+++ b/packages/sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@phala/sdk",
-  "version": "0.3.5",
+  "version": "0.3.6",
   "description": "Phala Phat Contract JS SDK",
   "homepage": "https://github.com/Phala-Network/js-sdk/tree/main/packages/sdk#readme",
   "repository": {
diff --git a/packages/sdk/src/certificate.ts b/packages/sdk/src/certificate.ts
index 4d69a52..881c362 100644
--- a/packages/sdk/src/certificate.ts
+++ b/packages/sdk/src/certificate.ts
@@ -115,21 +115,13 @@ export const signCertificate = async (
 
 const getSignatureTypeFromAccount = (account: InjectedAccountWithMeta) => {
   const keypairType = account.type || "sr25519";
-  // Polkadot JS signature use wrapBytes
-  const useWrapBytes = account.meta.source === "polkadot-js";
   switch (keypairType) {
     case "sr25519":
-      return useWrapBytes
-        ? pruntimeRpc.SignatureType.Sr25519WrapBytes
-        : pruntimeRpc.SignatureType.Sr25519;
+      return pruntimeRpc.SignatureType.Sr25519WrapBytes;
     case "ed25519":
-      return useWrapBytes
-        ? pruntimeRpc.SignatureType.Ed25519WrapBytes
-        : pruntimeRpc.SignatureType.Ed25519;
+      return pruntimeRpc.SignatureType.Ed25519WrapBytes;
     case "ecdsa":
-      return useWrapBytes
-        ? pruntimeRpc.SignatureType.EcdsaWrapBytes
-        : pruntimeRpc.SignatureType.Ecdsa;
+      return pruntimeRpc.SignatureType.EcdsaWrapBytes;
     default:
       throw new Error("Unsupported keypair type");
   }