diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/SKIT.FlurlHttpClient.Wechat.TenpayV2.csproj b/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/SKIT.FlurlHttpClient.Wechat.TenpayV2.csproj
index 572fa7fc..a2082223 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/SKIT.FlurlHttpClient.Wechat.TenpayV2.csproj
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/SKIT.FlurlHttpClient.Wechat.TenpayV2.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net462; net471; netstandard2.0; net6.0</TargetFrameworks>
+        <TargetFrameworks>net462; net471; netstandard2.0; net6.0; net9.0</TargetFrameworks>
         <LangVersion>10.0</LangVersion>
         <Nullable>enable</Nullable>
         <NullableReferenceTypes>true</NullableReferenceTypes>
diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Settings/WechatpayHttpHandler.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Settings/WechatpayHttpHandler.cs
index 2e9c6f3b..03b73aad 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Settings/WechatpayHttpHandler.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Settings/WechatpayHttpHandler.cs
@@ -28,6 +28,9 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV2.Settings
             {
                 X509Certificate x509;
 
+#if NET9_0_OR_GREATER
+                x509 = X509CertificateLoader.LoadPkcs12(certificateBytes, certificatePassword, X509KeyStorageFlags.UserKeySet | X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet);
+#else
 #if NET471_OR_GREATER || NETCOREAPP2_1_OR_GREATER || NET5_0_OR_GREATER
                 if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
 #else
@@ -44,6 +47,7 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV2.Settings
                         ? new X509Certificate2(certificateBytes)
                         : new X509Certificate2(certificateBytes, certificatePassword, X509KeyStorageFlags.UserKeySet | X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet);
                 }
+#endif
 
 #if NETCOREAPP2_1_OR_GREATER || NET5_0_OR_GREATER
                 handler.SslOptions.ClientCertificates = new X509CertificateCollection() { x509 };   
diff --git a/test/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests.csproj b/test/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests.csproj
index 89dd0b78..14295b24 100644
--- a/test/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests.csproj
+++ b/test/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests/SKIT.FlurlHttpClient.Wechat.TenpayV2.UnitTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net472; net6.0</TargetFrameworks>
+		<TargetFrameworks>net472; net6.0; net9.0</TargetFrameworks>
 		<LangVersion>latest</LangVersion>
 		<Nullable>enable</Nullable>
 		<NullableReferenceTypes>true</NullableReferenceTypes>