diff --git a/host/src/FunctionsNetHost/FunctionsNetHost.csproj b/host/src/FunctionsNetHost/FunctionsNetHost.csproj
index 4f2fa1ae..ac197d32 100644
--- a/host/src/FunctionsNetHost/FunctionsNetHost.csproj
+++ b/host/src/FunctionsNetHost/FunctionsNetHost.csproj
@@ -30,8 +30,8 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
-    <PackageReference Include="System.Text.Json" Version="9.0.0-preview.6.24327.7" />
-    <PackageReference Include="Microsoft.NETCore.DotNetAppHost" Version="9.0.0-preview.6.24327.7" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
+    <PackageReference Include="Microsoft.NETCore.DotNetAppHost" Version="9.0.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/host/src/FunctionsNetHost/Native/NativeExports.cs b/host/src/FunctionsNetHost/Native/NativeExports.cs
index f5ef0155..555a288e 100644
--- a/host/src/FunctionsNetHost/Native/NativeExports.cs
+++ b/host/src/FunctionsNetHost/Native/NativeExports.cs
@@ -33,6 +33,25 @@ public static unsafe int RegisterCallbacks(IntPtr pInProcessApplication,
                 Logger.Log($"Error in RegisterCallbacks: {ex}");
                 return 0;
             }
+        }
+
+        [UnmanagedCallersOnly(EntryPoint = "register_startuphook_callback")]
+        public static unsafe int RegisterStartupHookCallback(IntPtr pInProcessApplication,
+                                        delegate* unmanaged<byte**, int, IntPtr, IntPtr> requestCallback,
+    IntPtr grpcHandler)
+        {
+            Logger.LogTrace("NativeExports.RegisterStartupHookCallback method invoked.");
+
+            try
+            {
+                NativeHostApplication.Instance.SetStartupHookCallbackHandles(requestCallback, grpcHandler);
+                return 1;
+            }
+            catch (Exception ex)
+            {
+                Logger.Log($"Error in RegisterStartupHookCallback: {ex}");
+                return 0;
+            }
         }
 
         [UnmanagedCallersOnly(EntryPoint = "send_streaming_message")]
diff --git a/host/src/PlaceholderApp/Interop/NativeMethods.cs b/host/src/PlaceholderApp/Interop/NativeMethods.cs
index f95bcc7c..760eee00 100644
--- a/host/src/PlaceholderApp/Interop/NativeMethods.cs
+++ b/host/src/PlaceholderApp/Interop/NativeMethods.cs
@@ -26,7 +26,7 @@ internal static unsafe void RegisterForStartupHookCallback()
 
         internal static void RegisterStartupHookMessageHandlingCallback(delegate* unmanaged<byte**, int, nint, nint> requestCallback, nint grpcHandler)
         {
-            _ = register_startuphook_callbacks(nint.Zero, requestCallback, grpcHandler);
+            _ = register_startuphook_callback(nint.Zero, requestCallback, grpcHandler);
         }
 
         /// <summary>
@@ -45,7 +45,7 @@ internal static SpecializeMessage WaitForSpecializationMessage()
         }
 
         [DllImport(NativeWorkerDll)]
-        private static extern unsafe int register_startuphook_callbacks(nint pInProcessApplication, delegate* unmanaged<byte**, int, nint, nint> requestCallback, nint grpcHandler);
+        private static extern unsafe int register_startuphook_callback(nint pInProcessApplication, delegate* unmanaged<byte**, int, nint, nint> requestCallback, nint grpcHandler);
 
         [UnmanagedCallersOnly]
         private static unsafe nint StartupHookCallbackHandler(byte** nativeMessage, int nativeMessageSize, nint grpcHandler)