diff --git a/src/Core__Serializer.mjs b/src/Core__Serializer.mjs
deleted file mode 100644
index 909783bc..00000000
--- a/src/Core__Serializer.mjs
+++ /dev/null
@@ -1,41 +0,0 @@
-// Generated by ReScript, PLEASE EDIT WITH CARE
-
-
-function encodeUndefined(_key, value) {
-  if (value === undefined) {
-    return {
-            __rescript_private_none: true
-          };
-  } else {
-    return value;
-  }
-}
-
-function serializeExn(x) {
-  return JSON.stringify(x, encodeUndefined);
-}
-
-function deserializeUnsafe(x) {
-  var undefinedValues = [];
-  var value = JSON.parse(x, (function (key, value) {
-          var $$this = this ;
-          if (!(value == null) && value.__rescript_private_none) {
-            undefinedValues.push([
-                  $$this,
-                  key
-                ]);
-          }
-          return value;
-        }));
-  undefinedValues.forEach(function (param) {
-        param[0][param[1]] = undefined;
-      });
-  return value;
-}
-
-export {
-  encodeUndefined ,
-  serializeExn ,
-  deserializeUnsafe ,
-}
-/* No side effect */
diff --git a/src/Core__Serializer.res b/src/Core__Serializer.res
deleted file mode 100644
index 4b06d597..00000000
--- a/src/Core__Serializer.res
+++ /dev/null
@@ -1,25 +0,0 @@
-type undefined = {__rescript_private_none: bool}
-
-let encodeUndefined = (_key, value) =>
-  value === Core__Undefined.empty ? Core__Undefined.make({__rescript_private_none: true}) : value
-
-@val external _stringify: ('a, (string, 'b) => 'c) => option<string> = "JSON.stringify"
-let serializeExn = x => _stringify(x, encodeUndefined)
-
-@val external _parse: (string, @this ({..}, string, 'b) => 'c) => 'a = "JSON.parse"
-
-let deserializeUnsafe = x => {
-  let undefinedValues = []
-  let value = _parse(x, @this (this, key, value) => {
-    switch value->Core__Nullable.toOption {
-    | Some(x) if x.__rescript_private_none =>
-      let _ = undefinedValues->Core__Array.push((this, key))
-    | _ => ()
-    }
-    value
-  })
-  undefinedValues->Core__Array.forEach(((object, key)) => {
-    object->Core__Object.set(key, Js.Undefined.empty)
-  })
-  value
-}
diff --git a/src/RescriptCore.mjs b/src/RescriptCore.mjs
index 281e3abb..760c8d0d 100644
--- a/src/RescriptCore.mjs
+++ b/src/RescriptCore.mjs
@@ -81,8 +81,6 @@ var $$BigUint64Array;
 
 var $$Intl;
 
-var Serializer;
-
 var MapperRt;
 
 var Internal;
@@ -138,7 +136,6 @@ export {
   $$BigInt64Array ,
   $$BigUint64Array ,
   $$Intl ,
-  Serializer ,
   MapperRt ,
   Internal ,
   Re ,
diff --git a/src/RescriptCore.res b/src/RescriptCore.res
index 900efe67..e8262f17 100644
--- a/src/RescriptCore.res
+++ b/src/RescriptCore.res
@@ -44,8 +44,6 @@ module BigUint64Array = Core__BigUint64Array
 
 module Intl = Core__Intl
 
-module Serializer = Core__Serializer
-
 @val external window: Dom.window = "window"
 @val external document: Dom.document = "document"
 @val external globalThis: {..} = "globalThis"