diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/UnityEngineCompatibility.cs b/Assets/UniGLTF/Runtime/UniGLTF/Format/UnityEngineCompatibility.cs
deleted file mode 100644
index 3606ed0e3..000000000
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/UnityEngineCompatibility.cs
+++ /dev/null
@@ -1,52 +0,0 @@
-/// <summary>
-/// Unity互換のためのダミー
-/// </summary>
-
-#if UNITY_5_6_OR_NEWER
-#else
-using System;
-
-namespace UnityEngine
-{
-    public struct Vector2
-    {
-        public float x;
-        public float y;
-    }
-
-    public struct Vector3 : IEquatable<Vector3>
-    {
-        public float x;
-        public float y;
-        public float z;
-
-        public static Vector3 zero => new Vector3();
-
-        public bool Equals(Vector3 other)
-        {
-            if (x != other.x) return false;
-            if (y != other.y) return false;
-            if (z != other.z) return false;
-            return true;
-        }
-
-        public static bool operator ==(Vector3 lhs, Vector3 rhs)
-        {
-            return lhs.Equals(rhs);
-        }
-
-        public static bool operator !=(Vector3 lhs, Vector3 rhs)
-        {
-            return !(lhs == rhs);
-        }
-    }
-
-    public struct Vector4
-    {
-        public float x;
-        public float y;
-        public float z;
-        public float w;
-    }
-}
-#endif
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/UnityEngineCompatibility.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/Format/UnityEngineCompatibility.cs.meta
deleted file mode 100644
index 520967fe6..000000000
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/UnityEngineCompatibility.cs.meta
+++ /dev/null
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: 967f9ca5fbe35cc42b1b5a294958ab41
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/Assets/VRMShaders/GLTF/IO/Runtime/Util/KeyValuePariExtensions.cs b/Assets/VRMShaders/GLTF/IO/Runtime/Util/KeyValuePariExtensions.cs
deleted file mode 100644
index 91a41891f..000000000
--- a/Assets/VRMShaders/GLTF/IO/Runtime/Util/KeyValuePariExtensions.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using System.Collections.Generic;
-
-namespace VRMShaders
-{
-    public static class KeyValuePariExtensions
-    {
-        public static void Deconstruct<T, U>(this KeyValuePair<T, U> pair, out T key, out U value)
-        {
-            key = pair.Key;
-            value = pair.Value;
-        }
-    }
-}
diff --git a/Assets/VRMShaders/GLTF/IO/Runtime/Util/KeyValuePariExtensions.cs.meta b/Assets/VRMShaders/GLTF/IO/Runtime/Util/KeyValuePariExtensions.cs.meta
deleted file mode 100644
index ec64d27cb..000000000
--- a/Assets/VRMShaders/GLTF/IO/Runtime/Util/KeyValuePariExtensions.cs.meta
+++ /dev/null
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: 7dd6ef3302d21eb4b83c4f8f2c1e47cf
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: