diff --git a/package.json b/package.json
index 3d4de984..effdf7a7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "deepcopy",
-  "version": "0.6.2",
+  "version": "0.6.3",
   "author": "sasa+1 <sasaplus1@gmail.com>",
   "contributors": [
     "kjirou <kjirou.web@gmail.com>"