diff --git a/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net6.csproj b/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net6.csproj
index 98c6f57f..2ee6a351 100644
--- a/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net6.csproj
+++ b/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net6.csproj
@@ -22,7 +22,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="6.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="6.0.2" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.0" />
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  Version="6.0.0" />
 		<PackageReference Include="Microsoft.Net.Http.Headers"  Version="2.2.8" />
diff --git a/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net7.csproj b/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net7.csproj
index 57d29d17..b8e2edb1 100644
--- a/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net7.csproj
+++ b/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net7.csproj
@@ -22,7 +22,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="6.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="6.0.2" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.0" />
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  Version="6.0.0" />
 		<PackageReference Include="Microsoft.Net.Http.Headers"  Version="2.2.8" />
diff --git a/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net8.csproj b/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net8.csproj
index 86dd417f..0617849d 100644
--- a/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net8.csproj
+++ b/Sample/Senparc.CO2NET.Sample.Consoles/Senparc.CO2NET.Sample.Consoles.Net8.csproj
@@ -22,7 +22,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.2" />
 		<PackageReference Include="Microsoft.Net.Http.Headers" Version="2.2.8" />
diff --git a/src/Senparc.CO2NET.WebApi/Senparc.CO2NET.WebApi.csproj b/src/Senparc.CO2NET.WebApi/Senparc.CO2NET.WebApi.csproj
index 1441dcc2..0f58a0f3 100644
--- a/src/Senparc.CO2NET.WebApi/Senparc.CO2NET.WebApi.csproj
+++ b/src/Senparc.CO2NET.WebApi/Senparc.CO2NET.WebApi.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.1;net8.0</TargetFrameworks>
-		<Version>2.1.1</Version>
+		<Version>2.1.2</Version>
 		<LangVersion>latest</LangVersion>
 		<AssemblyName>Senparc.CO2NET.WebApi</AssemblyName>
 		<RootNamespace>Senparc.CO2NET.WebApi</RootNamespace>
@@ -48,6 +48,7 @@
 			[2024-11-27] v2.0.1-beta3 add lock to AddAndInitDynamicApi() method
 			[2024-11-28] v2.0.2-beta3 Add UseLowerCaseApiName property for SenparcSetting
 			[2024-12-04] v2.1.0-beta3 update Start() method, set SenparcSetting in Config when AddSenparcGlobalService() run
+			[2025-08-20] v2.1.2 feat: Add default value GET to DefaultRequestMethod proprety
 		</PackageReleaseNotes>
 	</PropertyGroup>
 	<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
diff --git a/src/Senparc.CO2NET.WebApi/WebApiEngines/WebApiEngineOptions.cs b/src/Senparc.CO2NET.WebApi/WebApiEngines/WebApiEngineOptions.cs
index e168f78a..5a86f438 100644
--- a/src/Senparc.CO2NET.WebApi/WebApiEngines/WebApiEngineOptions.cs
+++ b/src/Senparc.CO2NET.WebApi/WebApiEngines/WebApiEngineOptions.cs
@@ -14,6 +14,9 @@ 2. Add unique WebApi name to duplicate method name
     Modification Identifier：Senparc - 20241128
     Modification Description：v2.0.2-beta3 Add UseLowerCaseApiName property for SenparcSetting
 
+    Modification Identifier：Senparc - 20250820
+    Modification Description：v2.1.2 feat: Add default value GET to DefaultRequestMethod proprety
+
 ----------------------------------------------------------------*/
 
 
@@ -64,7 +67,7 @@ public WebApiEngineOptions(string docXmlPath = null, ApiRequestMethod defaultReq
         /// <summary>
         /// Default request method (global default is Post)
         /// </summary>
-        public ApiRequestMethod DefaultRequestMethod { get; set; }
+        public ApiRequestMethod DefaultRequestMethod { get; set; } = ApiRequestMethod.Post;
         /// <summary>
         /// Global ApiController base class, default is ControllerBase
         /// </summary>