diff --git a/Scripts/Format/Editor/VRMVersionMenu.cs b/Scripts/Format/Editor/VRMVersionMenu.cs
index e17f843ac..c3c4d82a7 100644
--- a/Scripts/Format/Editor/VRMVersionMenu.cs
+++ b/Scripts/Format/Editor/VRMVersionMenu.cs
@@ -91,7 +91,7 @@ namespace VRM
 
                     var subJson = subFormatter.ToString();
                     var path = dir.Child(fileName);
-                    File.WriteAllText(path.FullPath, subJson, Encoding.UTF8);
+                    File.WriteAllText(path.FullPath, subJson);
                 }
             }
         }
@@ -136,7 +136,7 @@ namespace VRM
                 
             var path = dir.Child("vrm.schema.json");
             Debug.LogFormat("write JsonSchema: {0}", path.FullPath);
-            File.WriteAllText(path.FullPath, json, Encoding.UTF8);
+            File.WriteAllText(path.FullPath, json);
             return path;
         }
 
diff --git a/Scripts/SpringBone/VRMSpringUtility.cs b/Scripts/SpringBone/VRMSpringUtility.cs
index 75a1b7a1c..e555d36e8 100644
--- a/Scripts/SpringBone/VRMSpringUtility.cs
+++ b/Scripts/SpringBone/VRMSpringUtility.cs
@@ -56,7 +56,7 @@ namespace VRM
                 spring.boneGroups.Add
                 );
 
-            File.WriteAllText(path, spring.ToJson(), Encoding.UTF8);
+            File.WriteAllText(path, spring.ToJson());
         }
 
         #endregion