diff --git a/WebApi.Test/Client/Update/UpdateClientIntegrationTest.cs b/WebApi.Test/Client/Update/UpdateClientIntegrationTest.cs
new file mode 100644
index 0000000..32eef69
--- /dev/null
+++ b/WebApi.Test/Client/Update/UpdateClientIntegrationTest.cs
@@ -0,0 +1,69 @@
+using Microsoft.AspNetCore.Mvc.Testing;
+using Newtonsoft.Json;
+using Shouldly;
+using System.Net.Http.Headers;
+using ClientEntity = ProductClientHub.Domain.Entities.Client;
+
+namespace WebApi.Test.Client.Update;
+
+public class UpdateClientIntegrationTest : IClassFixture<CustomWebApplicationFactory>
+{
+    private readonly CustomWebApplicationFactory _factory;
+    private readonly HttpClient _httpClient;
+
+    public UpdateClientIntegrationTest(CustomWebApplicationFactory factory)
+    {
+        _factory = factory;
+        _httpClient = factory.CreateClient(new WebApplicationFactoryClientOptions
+        {
+            BaseAddress = new Uri("https://localhost")
+        });
+
+        _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "fake-token");
+    }
+
+    [Fact]
+    public async Task UpdateClientTest_Sucess()
+    {
+        var client = _factory.ClientsToReturn =
+        [
+            new ClientEntity
+            {
+                Name = "Update Client",
+                Email = "updateclient@gmail.com"
+            }
+        ];
+
+        client[0].Id = Guid.NewGuid();
+
+        var response = await _httpClient.PutAsync($"/api/clients/{client[0].Id}", new StringContent(JsonConvert.SerializeObject(client[0]), System.Text.Encoding.UTF8, "application/json"));
+
+        response.StatusCode.ShouldBe(System.Net.HttpStatusCode.OK);
+    }
+
+    [Fact]
+    public async Task UpdateClientTest_Error_EmailExist()
+    {
+        var client = _factory.ClientsToReturn =
+        [
+            new ClientEntity
+                {
+                    Name = "Update Client",
+                    Email = "updateclient@gmail.com"
+                },
+
+            new ClientEntity
+                {
+                    Name = "Update Client 2",
+                    Email = "updateclient@gmail.com"
+                }
+        ];
+
+        client[0].Id = Guid.NewGuid();
+        client[1].Id = Guid.NewGuid();
+
+        var response = await _httpClient.PutAsync($"/api/clients/{client[1].Id}", new StringContent(JsonConvert.SerializeObject(client[1]), System.Text.Encoding.UTF8, "application/json"));
+
+        response.StatusCode.ShouldBe(System.Net.HttpStatusCode.BadRequest);
+    }
+}
diff --git a/WebApi.Test/CustomWebApplicationFactory.cs b/WebApi.Test/CustomWebApplicationFactory.cs
index 9266e41..dacaa7e 100644
--- a/WebApi.Test/CustomWebApplicationFactory.cs
+++ b/WebApi.Test/CustomWebApplicationFactory.cs
@@ -4,9 +4,10 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Hosting;
-using ClientEntity = ProductClientHub.Domain.Entities.Client;
 using ProductClientHub.Domain.Repositories.Client;
+using ProductClientHub.Domain.Repositories.UnitOfWork;
 using ProductClientHub.Domain.Security.Tokens;
+using ClientEntity = ProductClientHub.Domain.Entities.Client;
 
 namespace WebApi.Test;
 
@@ -40,15 +41,19 @@ protected override void ConfigureWebHost(IWebHostBuilder builder)
             services.AddSingleton(_clientStore);
 
             services.RemoveAll<IClientReadOnlyRepository>();
+            services.RemoveAll<IClientWriteOnlyRepository>();
             services.RemoveAll<IAccessTokenValidator>();
             services.RemoveAll<IDeleteClientRepository>();
+            services.RemoveAll<IUnitOfWork>();
 
             // Remove all hosted services to prevent background services from running during tests
             services.RemoveAll(typeof(IHostedService));
 
             services.AddScoped<IClientReadOnlyRepository, FakeClientReadOnlyRepository>();
+            services.AddScoped<IClientWriteOnlyRepository, FakeClientWriteOnlyRepository>();
             services.AddScoped<IAccessTokenValidator, FakeAccessTokenValidator>();
             services.AddScoped<IDeleteClientRepository, FakeDeleteClientRepository>();
+            services.AddScoped<IUnitOfWork, FakeUnitOfWork>();
         });
     }
 
@@ -68,7 +73,10 @@ public FakeClientReadOnlyRepository(TestClientStore clientStore)
         }
 
         public Task<ClientEntity?> EmailAlreadyExists(string email)
-            => Task.FromResult<ClientEntity?>(null);
+        {
+            var client = _clientStore.Clients.FirstOrDefault(c => c.Email == email);
+            return Task.FromResult<ClientEntity?>(client);
+        }
 
         public Task<IList<ClientEntity>> GetAll()
             => Task.FromResult<IList<ClientEntity>>(_clientStore.Clients);
@@ -102,6 +110,38 @@ public Task Delete(Guid clientId)
         }
     }
 
+    private sealed class FakeClientWriteOnlyRepository : IClientWriteOnlyRepository
+    {
+        private readonly TestClientStore _clientStore;
+
+        public FakeClientWriteOnlyRepository(TestClientStore clientStore)
+        {
+            _clientStore = clientStore;
+        }
+
+        public Task Add(ClientEntity client)
+        {
+            _clientStore.Clients.Add(client);
+            return Task.CompletedTask;
+        }
+
+        public Task<ClientEntity?> Update(ClientEntity client)
+        {
+            var existingClient = _clientStore.Clients.FirstOrDefault(c => c.Id == client.Id);
+            if (existingClient != null)
+            {
+                existingClient.Name = client.Name;
+                existingClient.Email = client.Email;
+            }
+            return Task.FromResult<ClientEntity?>(existingClient);
+        }
+    }
+
+    private sealed class FakeUnitOfWork : IUnitOfWork
+    {
+        public Task Commit() => Task.CompletedTask;
+    }
+
     private sealed class TestClientStore
     {
         public IList<ClientEntity> Clients { get; set; } = [];