diff --git a/package.json b/package.json
index b7f7e33..8e0436c 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
     "type": "git",
     "url": "git+https://github.com/kiki-kanri/kikiutils-node.git"
   },
+  "type": "module",
   "scripts": {
     "build": "rm -rf ./dist && tsc-multi",
     "bumplog": "changelogen --bump"
@@ -28,11 +29,12 @@
     "typescript": "^5.4.5"
   },
   "keywords": [],
+  "engines": {
+    "node": ">=18"
+  },
   "exports": {
     "./*": {
       "default": "./*.mjs",
-      "import": "./*.mjs",
-      "require": "./*.cjs",
       "types": "./*.d.ts"
     }
   },
diff --git a/tsc-multi.json b/tsc-multi.json
index 3794a48..4b5dac9 100644
--- a/tsc-multi.json
+++ b/tsc-multi.json
@@ -1,3 +1,3 @@
 {
-  "targets": [{ "extname": ".cjs" }, { "extname": ".mjs" }]
+  "targets": [{ "extname": ".mjs" }]
 }