diff --git a/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs b/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs
index 216c880a4..cf159b938 100644
--- a/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs
+++ b/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs
@@ -1,3 +1,4 @@
+using Yavsc.Abstract.Identity;
 using PostIt.ViewModels;
 
 namespace PostIt.Tests;
@@ -66,11 +67,23 @@ public class HomePageProviderFlowTests
         Assert.NotNull(vm.RefreshCommand);
     }
 
+    [Fact]
+    public void ProfileUpdateRequest_allows_username_updates()
+    {
+        var request = new ProfileUpdateRequest
+        {
+            UserName = "alice.new"
+        };
+
+        Assert.Equal("alice.new", request.UserName);
+    }
+
     [Fact]
     public void UserProfilePage_can_save_profile_values()
     {
         var vm = new UserProfilePageViewModel
         {
+            UserName = "alice.new",
             FullName = "Alice Example",
             Address = "14 rue de l’Érable",
             DedicatedGoogleCalendar = "calendar-123",
diff --git a/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs b/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs
index 9bf204cfc..6f78d854e 100644
--- a/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs
@@ -109,10 +109,11 @@ public partial class UserProfilePageViewModel : ViewModelBase
         {
             var payload = new ProfileUpdateRequest
             {
-                FullName = FullName,
-                Address = Address,
-                GoogleCalendarId = DedicatedGoogleCalendar == "Non configuré" ? string.Empty : DedicatedGoogleCalendar,
-                BankInfoSummary = BankInfoSummary == "Aucune information bancaire" ? string.Empty : BankInfoSummary
+                UserName = string.IsNullOrWhiteSpace(UserName) ? string.Empty : UserName.Trim(),
+                FullName = string.IsNullOrWhiteSpace(FullName) ? string.Empty : FullName.Trim(),
+                Address = string.IsNullOrWhiteSpace(Address) ? string.Empty : Address.Trim(),
+                GoogleCalendarId = DedicatedGoogleCalendar == "Non configuré" ? string.Empty : DedicatedGoogleCalendar.Trim(),
+                BankInfoSummary = BankInfoSummary == "Aucune information bancaire" ? string.Empty : BankInfoSummary.Trim()
             };
 
             var endpoint = new Uri(new Uri(_api.Settings.ApiUrl.TrimEnd('/') + "/", UriKind.Absolute), "account/me").ToString();
diff --git a/src/PostIt/PostIt/Views/Layout/UserProfilePage.axaml b/src/PostIt/PostIt/Views/Layout/UserProfilePage.axaml
index 6922b6204..ad190e6da 100644
--- a/src/PostIt/PostIt/Views/Layout/UserProfilePage.axaml
+++ b/src/PostIt/PostIt/Views/Layout/UserProfilePage.axaml
@@ -18,12 +18,13 @@
                  IsIndeterminate="True"
                  Height="8"/>
 
-    <Grid RowDefinitions="Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="*" RowSpacing="8">
-      <TextBox Watermark="Nom complet" Text="{Binding FullName}"/>
-      <TextBox Grid.Row="1" Watermark="Adresse" Text="{Binding Address}" AcceptsReturn="True" TextWrapping="Wrap"/>
-      <TextBox Grid.Row="2" Watermark="Calendrier Google" Text="{Binding DedicatedGoogleCalendar}"/>
-      <TextBox Grid.Row="3" Watermark="Détails bancaires" Text="{Binding BankInfoSummary}" AcceptsReturn="True" TextWrapping="Wrap"/>
-      <Button Grid.Row="4" Content="Enregistrer" Command="{Binding SaveProfileCommand}" IsEnabled="{Binding !IsBusy}"/>
+    <Grid RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="*" RowSpacing="8">
+      <TextBox Watermark="Nom d’utilisateur" Text="{Binding UserName}"/>
+      <TextBox Grid.Row="1" Watermark="Nom complet" Text="{Binding FullName}"/>
+      <TextBox Grid.Row="2" Watermark="Adresse" Text="{Binding Address}" AcceptsReturn="True" TextWrapping="Wrap"/>
+      <TextBox Grid.Row="3" Watermark="Calendrier Google" Text="{Binding DedicatedGoogleCalendar}"/>
+      <TextBox Grid.Row="4" Watermark="Détails bancaires" Text="{Binding BankInfoSummary}" AcceptsReturn="True" TextWrapping="Wrap"/>
+      <Button Grid.Row="5" Content="Enregistrer" Command="{Binding SaveProfileCommand}" IsEnabled="{Binding !IsBusy}"/>
     </Grid>
 
     <TextBlock Text="{Binding UserName, StringFormat='Nom d’utilisateur : {0}'}"/>
diff --git a/src/Yavsc.Abstract/Identity/ProfileUpdateRequest.cs b/src/Yavsc.Abstract/Identity/ProfileUpdateRequest.cs
index 6c9f28a22..def035d06 100644
--- a/src/Yavsc.Abstract/Identity/ProfileUpdateRequest.cs
+++ b/src/Yavsc.Abstract/Identity/ProfileUpdateRequest.cs
@@ -4,6 +4,7 @@ namespace Yavsc.Abstract.Identity;
 
 public class ProfileUpdateRequest
 {
+    public string? UserName { get; set; }
     public string? FullName { get; set; }
     public string? Address { get; set; }
     public string? GoogleCalendarId { get; set; }
diff --git a/src/Yavsc.Api/Controllers/accounting/AccountController.cs b/src/Yavsc.Api/Controllers/accounting/AccountController.cs
index 743ca1a5a..901441d67 100644
--- a/src/Yavsc.Api/Controllers/accounting/AccountController.cs
+++ b/src/Yavsc.Api/Controllers/accounting/AccountController.cs
@@ -103,6 +103,19 @@ namespace Yavsc.WebApi.Controllers
                 return NotFound();
             }
 
+            if (!string.IsNullOrWhiteSpace(request.UserName))
+            {
+                var trimmedUserName = request.UserName.Trim();
+                if (!string.Equals(user.UserName, trimmedUserName, StringComparison.Ordinal))
+                {
+                    var usernameUpdate = await _userManager.SetUserNameAsync(user, trimmedUserName);
+                    if (!usernameUpdate.Succeeded)
+                    {
+                        return BadRequest(new { error = "Unable to update username.", details = usernameUpdate.Errors.Select(e => e.Description) });
+                    }
+                }
+            }
+
             if (!string.IsNullOrWhiteSpace(request.FullName))
             {
                 user.FullName = request.FullName.Trim();