diff --git a/demoapp/src/main/java/com/mushare/demoapp/ui/login/LoginActivity.kt b/demoapp/src/main/java/com/mushare/demoapp/ui/login/LoginActivity.kt
index 75e6789..652b30b 100644
--- a/demoapp/src/main/java/com/mushare/demoapp/ui/login/LoginActivity.kt
+++ b/demoapp/src/main/java/com/mushare/demoapp/ui/login/LoginActivity.kt
@@ -30,7 +30,7 @@ class LoginActivity : AppCompatActivity() {
 
         Pluto.initialize(
             this,
-            "https://staging.easyjapanese-api-gateway.mushare.cn/pluto-master/",
+            "https://beta-pluto.kaboocha.com/",
             "org.mushare.easyjapanese"
         )
 
@@ -104,9 +104,14 @@ class LoginActivity : AppCompatActivity() {
             }
         }
 
-        if (Pluto.getInstance()?.state == Pluto.State.signin) {
-            startActivity(Intent(this, ProfileActivity::class.java))
-        }
+        Pluto.getInstance()?.state?.observe(this, Observer {
+            when (it) {
+                Pluto.State.signin -> {
+                    startActivity(Intent(this, ProfileActivity::class.java))
+                }
+            }
+        })
+
     }
 
     private fun updateUiWithUser(model: LoggedInUserView) {
diff --git a/demoapp/src/main/java/com/mushare/demoapp/ui/login/ProfileActivity.kt b/demoapp/src/main/java/com/mushare/demoapp/ui/login/ProfileActivity.kt
index 7941f7e..80e9432 100644
--- a/demoapp/src/main/java/com/mushare/demoapp/ui/login/ProfileActivity.kt
+++ b/demoapp/src/main/java/com/mushare/demoapp/ui/login/ProfileActivity.kt
@@ -1,7 +1,9 @@
 package com.mushare.demoapp.ui.login;
 
 import android.os.Bundle
+import android.util.Log
 import android.widget.Button
+import android.widget.EditText
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
@@ -9,22 +11,47 @@ import com.mushare.demoapp.R
 import com.mushare.plutosdk.Pluto
 import com.mushare.plutosdk.getToken
 import com.mushare.plutosdk.myInfo
+import com.mushare.plutosdk.updateName
+import java.lang.ref.WeakReference
 
 class ProfileActivity : AppCompatActivity() {
 
+    companion object {
+        private val TAG = ProfileActivity::class.java.simpleName
+    }
+
+    private lateinit var nameEditText: WeakReference<EditText>
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         setContentView(R.layout.activity_profile)
 
+        nameEditText = WeakReference(findViewById<EditText>(R.id.profile_name))
+
         Pluto.getInstance()?.myInfo(success = {
-            findViewById<TextView>(R.id.profile_name).text = it.name
+            nameEditText.get()?.setText(it.name)
         })
 
         Pluto.getInstance()?.getToken(completion = {
             findViewById<TextView>(R.id.profile_access_token).text = it ?: "Refresh failed"
         })
 
+        findViewById<Button>(R.id.profile_update_name).setOnClickListener {
+            val name = nameEditText.get()?.text.toString() ?: return@setOnClickListener
+            Pluto.getInstance()?.updateName(
+                name = name,
+                success = {
+                    Pluto.getInstance()?.myInfo(success = {
+                        Toast.makeText(this, "Name updated", Toast.LENGTH_SHORT).show()
+                    })
+                },
+                error = {
+                    Log.d(TAG, "Error updating username $it")
+                }
+            )
+        }
+
         findViewById<Button>(R.id.profile_refresh_token).setOnClickListener {
             Pluto.getInstance()?.getToken(isForceRefresh = true, completion = {
                 findViewById<TextView>(R.id.profile_access_token).text = it ?: "Refresh failed"
diff --git a/demoapp/src/main/res/layout/activity_profile.xml b/demoapp/src/main/res/layout/activity_profile.xml
index ba0cf3c..8c94c96 100644
--- a/demoapp/src/main/res/layout/activity_profile.xml
+++ b/demoapp/src/main/res/layout/activity_profile.xml
@@ -4,7 +4,7 @@
     android:layout_height="match_parent"
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
-    <TextView
+    <EditText
         android:id="@+id/profile_name"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
@@ -12,15 +12,26 @@
         android:layout_marginStart="20dp"
         android:layout_marginTop="20dp"
         android:layout_marginEnd="20dp"
-        android:text="Username"/>
+        android:hint="Username"/>
 
     <Button
-        android:id="@+id/profile_refresh_token"
+        android:id="@+id/profile_update_name"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:layout_constraintTop_toBottomOf="@id/profile_name"
         android:layout_marginStart="20dp"
-        android:layout_marginTop="20dp"
+        android:layout_marginTop="10dp"
+        android:layout_marginEnd="20dp"
+        android:text="Update Username"
+        />
+
+    <Button
+        android:id="@+id/profile_refresh_token"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toBottomOf="@id/profile_update_name"
+        android:layout_marginStart="20dp"
+        android:layout_marginTop="10dp"
         android:layout_marginEnd="20dp"
         android:text="Refresh Token"/>
 
diff --git a/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+Login.kt b/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+Login.kt
index cc7f54f..8bae673 100644
--- a/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+Login.kt
+++ b/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+Login.kt
@@ -5,7 +5,14 @@ import retrofit2.Call
 import retrofit2.Callback
 import retrofit2.Response
 
-fun Pluto.registerByEmail(address: String, password: String, name: String, success: () -> Unit, error: ((PlutoError) -> Unit)? = null, handler: Pluto.PlutoRequestHandler? = null) {
+fun Pluto.registerByEmail(
+    address: String,
+    password: String,
+    name: String,
+    success: () -> Unit,
+    error: ((PlutoError) -> Unit)? = null,
+    handler: Pluto.PlutoRequestHandler? = null
+) {
     plutoService.registerWithEmail(RegisterWithEmailPostData(address, password, name, appId), getLanguage()).apply {
         enqueue(object : Callback<PlutoResponse> {
             override fun onFailure(call: Call<PlutoResponse>, t: Throwable) {
@@ -31,7 +38,12 @@ fun Pluto.registerByEmail(address: String, password: String, name: String, succe
     }
 }
 
-fun Pluto.resendValidationEmail(address: String, success: () -> Unit, error: ((PlutoError) -> Unit)? = null, handler: Pluto.PlutoRequestHandler? = null) {
+fun Pluto.resendValidationEmail(
+    address: String,
+    success: () -> Unit,
+    error: ((PlutoError) -> Unit)? = null,
+    handler: Pluto.PlutoRequestHandler? = null
+) {
     plutoService.resendValidationEmail(EmailPostData(address, appId), getLanguage()).apply {
         enqueue(object : Callback<PlutoResponse> {
             override fun onFailure(call: Call<PlutoResponse>, t: Throwable) {
@@ -57,7 +69,13 @@ fun Pluto.resendValidationEmail(address: String, success: () -> Unit, error: ((P
     }
 }
 
-fun Pluto.loginWithAccount(address: String, password: String, success: (() -> Unit)? = null, error: ((PlutoError) -> Unit)? = null, handler: Pluto.PlutoRequestHandler? = null) {
+fun Pluto.loginWithAccount(
+    address: String,
+    password: String,
+    success: (() -> Unit)? = null,
+    error: ((PlutoError) -> Unit)? = null,
+    handler: Pluto.PlutoRequestHandler? = null
+) {
     val deviceId = data.deviceID
     if (deviceId == null) {
         error?.invoke(PlutoError.badRequest)
@@ -84,7 +102,12 @@ fun Pluto.loginWithAccount(address: String, password: String, success: (() -> Un
     }
 }
 
-fun Pluto.loginWithGoogle(idToken: String, success: (() -> Unit)? = null, error: ((PlutoError) -> Unit)? = null, handler: Pluto.PlutoRequestHandler? = null) {
+fun Pluto.loginWithGoogle(
+    idToken: String,
+    success: (() -> Unit)? = null,
+    error: ((PlutoError) -> Unit)? = null,
+    handler: Pluto.PlutoRequestHandler? = null
+) {
     val deviceId = data.deviceID
     if (deviceId == null) {
         error?.invoke(PlutoError.badRequest)
@@ -111,7 +134,12 @@ fun Pluto.loginWithGoogle(idToken: String, success: (() -> Unit)? = null, error:
     }
 }
 
-fun Pluto.resetPassword(address: String, success: () -> Unit, error: ((PlutoError) -> Unit)? = null, handler: Pluto.PlutoRequestHandler? = null) {
+fun Pluto.resetPassword(
+    address: String,
+    success: () -> Unit,
+    error: ((PlutoError) -> Unit)? = null,
+    handler: Pluto.PlutoRequestHandler? = null
+) {
     plutoService.resetPassword(EmailPostData(address, appId), getLanguage()).apply {
         enqueue(object : Callback<PlutoResponse> {
             override fun onFailure(call: Call<PlutoResponse>, t: Throwable) {
@@ -142,7 +170,10 @@ fun Pluto.logout() {
     state.postValue(Pluto.State.notSignin)
 }
 
-private fun Pluto.handleLogin(response: PlutoResponseWithBody<LoginResponse>, success: (() -> Unit)?, error: ((PlutoError) -> Unit)?) {
+private fun Pluto.handleLogin(
+    response: PlutoResponseWithBody<LoginResponse>,
+    success: (() -> Unit)?, error: ((PlutoError) -> Unit)?
+) {
     if (response.statusOK()) {
         val body = response.getBody()
         data.updateRefreshToken(body.refreshToken)
diff --git a/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+User.kt b/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+User.kt
index 7f2afaa..f310336 100644
--- a/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+User.kt
+++ b/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/Pluto+User.kt
@@ -3,21 +3,38 @@ package com.mushare.plutosdk
 import retrofit2.Call
 import retrofit2.Callback
 import retrofit2.Response
-fun Pluto.myInfo(success: (PlutoUser) -> Unit, error: ((PlutoError) -> Unit)? = null, handler: Pluto.PlutoRequestHandler? = null) {
+
+fun Pluto.myInfo(
+    success: (PlutoUser) -> Unit,
+    error: ((PlutoError) -> Unit)? = null,
+    handler: Pluto.PlutoRequestHandler? = null
+) {
     data.user?.let {
         success(it)
         return
     }
-    getAuthorizationHeader({ header ->
-        if (header != null) {
-            plutoService.getAccountInfo(header).apply {
+    getAuthorizationHeader(
+        completion = { header ->
+            if (header == null) {
+                handler?.setCall(null)
+                error?.invoke(PlutoError.notSignin)
+                return@getAuthorizationHeader
+            }
+
+            plutoService.getUserInfo(header).apply {
                 enqueue(object : Callback<PlutoResponseWithBody<PlutoUser>> {
-                    override fun onFailure(call: Call<PlutoResponseWithBody<PlutoUser>>, t: Throwable) {
+                    override fun onFailure(
+                        call: Call<PlutoResponseWithBody<PlutoUser>>,
+                        t: Throwable
+                    ) {
                         t.printStackTrace()
                         error?.invoke(PlutoError.badRequest)
                     }
 
-                    override fun onResponse(call: Call<PlutoResponseWithBody<PlutoUser>>, response: Response<PlutoResponseWithBody<PlutoUser>>) {
+                    override fun onResponse(
+                        call: Call<PlutoResponseWithBody<PlutoUser>>,
+                        response: Response<PlutoResponseWithBody<PlutoUser>>
+                    ) {
                         val plutoResponse = response.body()
                         if (plutoResponse != null) {
                             if (plutoResponse.statusOK()) {
@@ -26,16 +43,70 @@ fun Pluto.myInfo(success: (PlutoUser) -> Unit, error: ((PlutoError) -> Unit)? =
                                 error?.invoke(plutoResponse.errorCode())
                             }
                         } else {
-                            error?.invoke(parseErrorCodeFromErrorBody(response.errorBody(), gson))
+                            error?.invoke(
+                                parseErrorCodeFromErrorBody(
+                                    response.errorBody(),
+                                    gson
+                                )
+                            )
+                        }
+                    }
+                })
+            }.also {
+                handler?.setCall(it)
+            }
+        },
+        handler = handler
+    )
+}
+
+fun Pluto.updateName(
+    name: String,
+    success: () -> Unit,
+    error: ((PlutoError) -> Unit)? = null,
+    handler: Pluto.PlutoRequestHandler? = null
+) {
+    getAuthorizationHeader(
+        completion = { header ->
+            if (header == null) {
+                handler?.setCall(null)
+                error?.invoke(PlutoError.notSignin)
+                return@getAuthorizationHeader
+            }
+
+            val body = UpdateUserInfoPutData(name, null)
+            plutoService.updateUserInfo(body, header).apply {
+                enqueue(object : Callback<PlutoResponse> {
+                    override fun onFailure(call: Call<PlutoResponse>, t: Throwable) {
+                        t.printStackTrace()
+                        error?.invoke(PlutoError.badRequest)
+                    }
+
+                    override fun onResponse(
+                        call: Call<PlutoResponse>,
+                        response: Response<PlutoResponse>
+                    ) {
+                        val plutoResponse = response.body()
+                        if (plutoResponse != null) {
+                            if (plutoResponse.statusOK()) {
+                                success()
+                            } else {
+                                error?.invoke(plutoResponse.errorCode())
+                            }
+                        } else {
+                            error?.invoke(
+                                parseErrorCodeFromErrorBody(
+                                    response.errorBody(),
+                                    gson
+                                )
+                            )
                         }
                     }
                 })
             }.also {
                 handler?.setCall(it)
             }
-        } else {
-            handler?.setCall(null)
-            error?.invoke(PlutoError.notSignin)
-        }
-    }, handler)
-}
\ No newline at end of file
+        },
+        handler = handler
+    )
+}
diff --git a/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/PlutoService.kt b/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/PlutoService.kt
index 15532d0..76c423c 100644
--- a/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/PlutoService.kt
+++ b/pluto-kotlin-client-sdk/src/main/java/com/mushare/plutosdk/PlutoService.kt
@@ -39,9 +39,15 @@ interface PlutoService {
     ): Call<PlutoResponseWithBody<LoginResponse>>
 
     @GET("v1/user/info")
-    fun getAccountInfo(
+    fun getUserInfo(
         @HeaderMap authorizationHeader: Map<String, String>
     ): Call<PlutoResponseWithBody<PlutoUser>>
+
+    @PUT("v1/user/info")
+    fun updateUserInfo(
+        @Body body: UpdateUserInfoPutData,
+        @HeaderMap authorizationHeader: Map<String, String>
+    ): Call<PlutoResponse>
 }
 
 class RefreshAuthPostData(
@@ -72,4 +78,9 @@ class LoginWithGooglePostData(
     @field:SerializedName("id_token") var idToken: String,
     @field:SerializedName("device_id") var deviceId: String,
     @field:SerializedName("app_id") var appId: String
+)
+
+class UpdateUserInfoPutData(
+    @field:SerializedName("name") var name: String?,
+    @field:SerializedName("avatar") var avatar: String?
 )
\ No newline at end of file