diff --git a/Assets/VRM/UniVRM/Editor/Tests/UniVRMSerializeTests.cs b/Assets/VRM/UniVRM/Editor/Tests/UniVRMSerializeTests.cs
index e74cc5846..8fba75208 100644
--- a/Assets/VRM/UniVRM/Editor/Tests/UniVRMSerializeTests.cs
+++ b/Assets/VRM/UniVRM/Editor/Tests/UniVRMSerializeTests.cs
@@ -635,7 +635,7 @@ namespace VRM
                 EnableDiagnosisForNotRequiredFields = true,
             };
             var json2 = JsonSchema.FromType<glTF_VRM_extensions>().Serialize(model, c);
-            Assert.AreEqual(@"{""exporterVersion"":""UniVRM-0.50"",""schemaVersion"":""0.0""}",json2);
+            Assert.AreEqual(@"{""exporterVersion"":""UniVRM-0.50"",""specVersion"":""0.0""}",json2);
         }
 
         // TODO: Move to another suitable location
diff --git a/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs b/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs
index 741be3cca..501328e15 100644
--- a/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs
+++ b/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs
@@ -37,8 +37,8 @@ VRM extension is for 3d humanoid avatars (and models) in VR applications.
         [JsonSchema(Description = @"Version of exporter that vrm created. " + VRMVersion.VRM_VERSION)]
         public string exporterVersion = "UniVRM-" + VRMVersion.VERSION;
 
-        [JsonSchema(Description = @"Version of JSON Schema for VRM")]
-        public string schemaVersion = VRMSchemaVersion.Version;
+        [JsonSchema(Description = @"The VRM specification version that this extension uses")]
+        public string specVersion  = VRMSpecVersion.Version;
 
         public glTF_VRM_Meta meta = new glTF_VRM_Meta();
         public glTF_VRM_Humanoid humanoid = new glTF_VRM_Humanoid();
@@ -50,7 +50,7 @@ VRM extension is for 3d humanoid avatars (and models) in VR applications.
         protected override void SerializeMembers(GLTFJsonFormatter f)
         {
             f.KeyValue(() => exporterVersion);
-            f.KeyValue(() => schemaVersion);
+            f.KeyValue(() => specVersion);
             f.Key("meta"); f.GLTFValue(meta);
             f.Key("humanoid"); f.GLTFValue(humanoid);
             f.Key("firstPerson"); f.GLTFValue(firstPerson);
diff --git a/Assets/VRM/UniVRM/Scripts/Format/VRMSchemaVersion.cs b/Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs
similarity index 89%
rename from Assets/VRM/UniVRM/Scripts/Format/VRMSchemaVersion.cs
rename to Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs
index fab0d2e22..98ece65e7 100644
--- a/Assets/VRM/UniVRM/Scripts/Format/VRMSchemaVersion.cs
+++ b/Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs
@@ -2,7 +2,7 @@ using System;
 
 namespace VRM
 {
-    public class VRMSchemaVersion
+    public class VRMSpecVersion
     {
         public const int Major = 0;
         public const int Minor = 0;
diff --git a/Assets/VRM/UniVRM/Scripts/Format/VRMSchemaVersion.cs.meta b/Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs.meta
similarity index 100%
rename from Assets/VRM/UniVRM/Scripts/Format/VRMSchemaVersion.cs.meta
rename to Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs.meta