diff --git a/packages/caver-klay/caver-klay-accounts/src/index.js b/packages/caver-klay/caver-klay-accounts/src/index.js
index 00b4bc2b..493b400e 100644
--- a/packages/caver-klay/caver-klay-accounts/src/index.js
+++ b/packages/caver-klay/caver-klay-accounts/src/index.js
@@ -1394,9 +1394,7 @@ Accounts.prototype.decrypt = function(v3Keystore, password, nonStrict) {
     }
 
     // To deep copy an object, using JSON.parse and JSON.stringify (object -> string -> object)
-    const json = _.isObject(v3Keystore)
-        ? JSON.parse(JSON.stringify(v3Keystore))
-        : JSON.parse(nonStrict ? v3Keystore.toLowerCase() : v3Keystore)
+    const json = _.isObject(v3Keystore) ? _.cloneDeep(v3Keystore) : JSON.parse(nonStrict ? v3Keystore.toLowerCase() : v3Keystore)
 
     if (json.version !== 3 && json.version !== 4) {
         console.warn('This is not a V3 or V4 wallet.')
diff --git a/packages/caver-wallet/src/keyring/keyringFactory.js b/packages/caver-wallet/src/keyring/keyringFactory.js
index 84e5cf1d..c80a14cc 100644
--- a/packages/caver-wallet/src/keyring/keyringFactory.js
+++ b/packages/caver-wallet/src/keyring/keyringFactory.js
@@ -210,7 +210,7 @@ class KeyringFactory {
      */
     static decrypt(keystore, password) {
         // To deep copy an object, using JSON.parse and JSON.stringify (object -> string -> object)
-        const json = _.isObject(keystore) ? JSON.parse(JSON.stringify(keystore)) : JSON.parse(keystore)
+        const json = _.isObject(keystore) ? _.cloneDeep(keystore) : JSON.parse(keystore)
 
         if (json.version !== 3 && json.version !== 4) console.warn('This is not a V3 or V4 wallet.')