diff --git a/Assets/VRM/UniGLTF/Scripts/Format/ExtensionsAndExtras/KHR_texture_transform.cs b/Assets/VRM/UniGLTF/Scripts/Format/ExtensionsAndExtras/KHR_texture_transform.cs
new file mode 100644
index 000000000..37372a2db
--- /dev/null
+++ b/Assets/VRM/UniGLTF/Scripts/Format/ExtensionsAndExtras/KHR_texture_transform.cs
@@ -0,0 +1,54 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UniJSON;
+
+namespace UniGLTF
+{
+    [Serializable]
+    public class glTF_KHR_texture_transform : JsonSerializableBase
+    {
+        public static string ExtensionName
+        {
+            get
+            {
+                return "KHR_texture_transform";
+            }
+        }
+
+        [JsonSchema(MinItems = 2, MaxItems = 2)]
+        public float[] offset = new float[2] { 0.0f, 0.0f };
+
+        public float rotation;
+
+        [JsonSchema(MinItems = 2, MaxItems = 2)]
+        public float[] scale = new float[2] { 1.0f, 1.0f };
+
+        [ItemJsonSchema(Minimum = 0)]
+        public int texCoord;
+
+        protected override void SerializeMembers(GLTFJsonFormatter f)
+        {
+            f.KeyValue(() => offset);
+            f.KeyValue(() => rotation);
+            f.KeyValue(() => scale);
+            f.KeyValue(() => texCoord);
+        }
+    }
+
+    [Serializable]
+    public class glTFTextureInfo_extensions : ExtensionsBase<glTFTextureInfo_extensions>
+    {
+        [JsonSchema(Required = true)]
+        public glTF_KHR_texture_transform KHR_texture_transform;
+
+        [JsonSerializeMembers]
+        void SerializeMembers_unlit(GLTFJsonFormatter f)
+        {
+            if (KHR_texture_transform != null)
+            {
+                f.KeyValue(() => KHR_texture_transform);
+            }
+        }
+    }
+}
diff --git a/Assets/VRM/UniGLTF/Scripts/Format/ExtensionsAndExtras/KHR_texture_transform.cs.meta b/Assets/VRM/UniGLTF/Scripts/Format/ExtensionsAndExtras/KHR_texture_transform.cs.meta
new file mode 100644
index 000000000..692d123b6
--- /dev/null
+++ b/Assets/VRM/UniGLTF/Scripts/Format/ExtensionsAndExtras/KHR_texture_transform.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 04b631e1572e84d47b88aebc3631865b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM/UniGLTF/Scripts/Format/glTFMaterial.cs b/Assets/VRM/UniGLTF/Scripts/Format/glTFMaterial.cs
index cb51d9688..7c5b5dec6 100644
--- a/Assets/VRM/UniGLTF/Scripts/Format/glTFMaterial.cs
+++ b/Assets/VRM/UniGLTF/Scripts/Format/glTFMaterial.cs
@@ -28,13 +28,17 @@ namespace UniGLTF
         public int texCoord;
 
         // empty schemas
-        public object extensions;
+        public glTFTextureInfo_extensions extensions;
         public object extras;
 
         protected override void SerializeMembers(GLTFJsonFormatter f)
         {
             f.KeyValue(() => index);
             f.KeyValue(() => texCoord);
+            if (extensions != null)
+            {
+                f.KeyValue(() => extensions);
+            }
         }
 
         public abstract glTFTextureTypes TextreType { get; }