diff --git a/Shogi.Api/Shogi.Api.csproj b/Shogi.Api/Shogi.Api.csproj
index 45ade0c..e237ce2 100644
--- a/Shogi.Api/Shogi.Api.csproj
+++ b/Shogi.Api/Shogi.Api.csproj
@@ -29,7 +29,7 @@
     <PackageReference Include="FluentValidation" Version="11.9.0" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.1" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="8.0.1" />
-    <PackageReference Include="Microsoft.Identity.Web" Version="2.16.1" />
+    <PackageReference Include="Microsoft.Identity.Web" Version="2.17.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0" />
     <PackageReference Include="System.Data.SqlClient" Version="4.8.6" />
   </ItemGroup>
diff --git a/Shogi.UI/Pages/Home/Api/ShogiApi.cs b/Shogi.UI/Pages/Home/Api/ShogiApi.cs
index a1a39e7..2e7b2eb 100644
--- a/Shogi.UI/Pages/Home/Api/ShogiApi.cs
+++ b/Shogi.UI/Pages/Home/Api/ShogiApi.cs
@@ -16,13 +16,16 @@ namespace Shogi.UI.Pages.Home.Api
         private readonly AccountState accountState;
         private readonly HttpClient guestHttpClient;
         private readonly HttpClient msalHttpClient;
+        private readonly string baseUrl;
 
-        public ShogiApi(IHttpClientFactory clientFactory, AccountState accountState)
+        public ShogiApi(IHttpClientFactory clientFactory, AccountState accountState, IConfiguration configuration)
         {
             this.serializerOptions = new JsonSerializerOptions(JsonSerializerDefaults.Web);
             this.accountState = accountState;
             this.guestHttpClient = clientFactory.CreateClient(GuestClientName);
             this.msalHttpClient = clientFactory.CreateClient(MsalClientName);
+            this.baseUrl = configuration["ShogiApiUrl"] ?? throw new InvalidOperationException("Configuration missing.");
+            this.baseUrl = this.baseUrl.TrimEnd('/');
         }
 
         private HttpClient HttpClient => accountState.User?.WhichAccountPlatform switch
@@ -40,7 +43,7 @@ namespace Shogi.UI.Pages.Home.Api
 
         public async Task<Session?> GetSession(string name)
         {
-            var response = await HttpClient.GetAsync(new Uri($"Sessions/{name}", UriKind.Relative));
+            var response = await HttpClient.GetAsync(RelativeUri($"Sessions/{name}"));
             if (response.IsSuccessStatusCode)
             {
                 return (await response.Content.ReadFromJsonAsync<ReadSessionResponse>(serializerOptions))?.Session;
@@ -98,6 +101,6 @@ namespace Shogi.UI.Pages.Home.Api
             return HttpClient.PatchAsync(RelativeUri($"Sessions/{name}/Join"), null);
         }
 
-        private static Uri RelativeUri(string path) => new(path, UriKind.Relative);
+        private Uri RelativeUri(string path) => new($"{this.baseUrl}/{path}", UriKind.Absolute);
     }
 }
diff --git a/Tests/AcceptanceTests/AcceptanceTests.csproj b/Tests/AcceptanceTests/AcceptanceTests.csproj
index 15efd8f..c0d9337 100644
--- a/Tests/AcceptanceTests/AcceptanceTests.csproj
+++ b/Tests/AcceptanceTests/AcceptanceTests.csproj
@@ -29,7 +29,7 @@
 		<PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.0" />
 		<PackageReference Include="Microsoft.Identity.Client" Version="4.59.0" />
 		<PackageReference Include="Microsoft.Net.Http.Headers" Version="8.0.1" />
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
 		<PackageReference Include="xunit" Version="2.6.6" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/Tests/E2ETests/E2ETests.csproj b/Tests/E2ETests/E2ETests.csproj
index 4cb444e..d91738a 100644
--- a/Tests/E2ETests/E2ETests.csproj
+++ b/Tests/E2ETests/E2ETests.csproj
@@ -9,11 +9,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="Microsoft.Playwright.NUnit" Version="1.41.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageReference Include="Microsoft.Playwright.NUnit" Version="1.41.2" />
     <PackageReference Include="NUnit" Version="4.0.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-    <PackageReference Include="NUnit.Analyzers" Version="3.10.0">
+    <PackageReference Include="NUnit.Analyzers" Version="4.0.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
diff --git a/Tests/UnitTests/UnitTests.csproj b/Tests/UnitTests/UnitTests.csproj
index 7885685..5572e69 100644
--- a/Tests/UnitTests/UnitTests.csproj
+++ b/Tests/UnitTests/UnitTests.csproj
@@ -9,7 +9,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="FluentAssertions" Version="6.12.0" />
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
 		<PackageReference Include="xunit" Version="2.6.6" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>