diff --git a/package-lock.json b/package-lock.json
index 9d92277..5ea5b03 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@terra-money/legacy.proto": "npm:@terra-money/terra.proto@^0.1.7",
-        "@terra-money/terra.proto": "5.1.0-beta.2",
+        "@terra-money/terra.proto": "^5.1.0-beta.3",
         "assert": "^2.0.0",
         "axios": "^0.27.2",
         "bech32": "^2.0.0",
@@ -1291,9 +1291,9 @@
       "integrity": "sha512-XsP+KhQif4bjX1kbuSiySJFNAehNxgLb6hPRGJ9QsUr8ajHkuXGdrHmFUTUUXhDwVX2R5bY4JNZEwbUiMhV+MA=="
     },
     "node_modules/@terra-money/terra.proto": {
-      "version": "5.1.0-beta.2",
-      "resolved": "https://registry.npmjs.org/@terra-money/terra.proto/-/terra.proto-5.1.0-beta.2.tgz",
-      "integrity": "sha512-2PxA+0ImHOS+0y8JvGzQXE2AwG5CpWpgq7PL8orE2m6dTWJYfEFxjZGmo1ID9/6aOa1T09dvkHNvTHPg2q06/Q==",
+      "version": "5.1.0-beta.3",
+      "resolved": "https://registry.npmjs.org/@terra-money/terra.proto/-/terra.proto-5.1.0-beta.3.tgz",
+      "integrity": "sha512-y69nixzKxV5AK/4Kgza/eF+0Ez++xpbnse5LrYI7ar43OMWP59gxeASeTZPLsbx8bG5CsqCtcRT/klFtwsDzXA==",
       "dependencies": {
         "@improbable-eng/grpc-web": "^0.14.1",
         "browser-headers": "^0.4.1",
diff --git a/package.json b/package.json
index c87a4ce..0c64ee7 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,7 @@
   },
   "dependencies": {
     "@terra-money/legacy.proto": "npm:@terra-money/terra.proto@^0.1.7",
-    "@terra-money/terra.proto": "5.1.0-beta.2",
+    "@terra-money/terra.proto": "^5.1.0-beta.3",
     "assert": "^2.0.0",
     "axios": "^0.27.2",
     "bech32": "^2.0.0",
@@ -104,4 +104,4 @@
     "utf-8-validate": "^5.0.5",
     "ws": "^7.5.9"
   }
-}
\ No newline at end of file
+}
diff --git a/src/core/smartaccount/v1/models/Initialization.ts b/src/core/smartaccount/v1/models/Initialization.ts
index b510940..f19f68f 100644
--- a/src/core/smartaccount/v1/models/Initialization.ts
+++ b/src/core/smartaccount/v1/models/Initialization.ts
@@ -16,29 +16,24 @@ export class Initialization extends JSONSerializable<
    * @param contractAddress contract address of authorization logic
    * @param initMsg initial message to be passed to the contract
    */
-  constructor(
-    public senders: string[],
-    public account: string,
-    public msg: Uint8Array
-  ) {
+  constructor(public account: string, public msg: Uint8Array) {
     super();
   }
 
   public static fromAmino(data: Initialization.Amino): Initialization {
     const {
-      value: { senders, account, msg },
+      value: { account, msg },
     } = data;
     const buf = Buffer.from(msg, 'ascii');
     const msgBs = new Uint8Array(buf);
-    return new Initialization(senders, account, msgBs);
+    return new Initialization(account, msgBs);
   }
 
   public toAmino(): Initialization.Amino {
-    const { senders, account, msg } = this;
+    const { account, msg } = this;
     const base64Str = Buffer.from(msg).toString('ascii');
     return {
       value: {
-        senders,
         account,
         msg: base64Str,
       },
@@ -46,30 +41,28 @@ export class Initialization extends JSONSerializable<
   }
 
   public static fromData(data: Initialization.Data): Initialization {
-    const { senders, account, msg } = data;
+    const { account, msg } = data;
     const buf = Buffer.from(msg, 'ascii');
     const msgBs = new Uint8Array(buf);
-    return new Initialization(senders, account, msgBs);
+    return new Initialization(account, msgBs);
   }
 
   public toData(): Initialization.Data {
-    const { senders, account, msg } = this;
+    const { account, msg } = this;
     const base64Str = Buffer.from(msg).toString('ascii');
     return {
-      senders,
       account,
       msg: base64Str,
     };
   }
 
   public static fromProto(proto: Initialization.Proto): Initialization {
-    return new Initialization(proto.senders, proto.account, proto.msg);
+    return new Initialization(proto.account, proto.msg);
   }
 
   public toProto(): Initialization.Proto {
-    const { senders, account, msg } = this;
+    const { account, msg } = this;
     return Initialization_pb.fromPartial({
-      senders,
       account,
       msg,
     });
@@ -89,14 +82,12 @@ export class Initialization extends JSONSerializable<
 export namespace Initialization {
   export interface Amino {
     value: {
-      senders: string[];
       account: string;
       msg: string;
     };
   }
 
   export interface Data {
-    senders: string[];
     account: string;
     msg: string;
   }