diff --git a/src/VoicevoxCoreSharp.Experimental/VoiceModelExtensions.cs b/src/VoicevoxCoreSharp.Experimental/VoiceModelExtensions.cs
index 2eecc28..8855c85 100644
--- a/src/VoicevoxCoreSharp.Experimental/VoiceModelExtensions.cs
+++ b/src/VoicevoxCoreSharp.Experimental/VoiceModelExtensions.cs
@@ -8,7 +8,11 @@ namespace VoicevoxCoreSharp.Experimental
 {
     public static partial class VoiceModelFileExtensions
     {
+        [Obsolete("Use VoiceModelFile.OpenAsync(string modelPath) instead.")]
         [NonBlocking]
         public static partial Task<VoiceModelFile> NewAsync(string modelPath);
+
+        [NonBlocking]
+        public static partial Task<VoiceModelFile> OpenAsync(string modelPath);
     }
 }