diff --git a/package.json b/package.json
index c866bb2..b795554 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,11 @@
 	"license": "MIT",
 	"author": "KATT",
 	"type": "module",
+	"exports": {
+		"import": "./lib/index.js",
+		"require": "./lib/index.cjs",
+		"default": "./lib/index.js"
+	},
 	"main": "./lib/index.js",
 	"files": [
 		"lib/",
diff --git a/tsup.config.ts b/tsup.config.ts
index 43c6f24..6624b1d 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -5,7 +5,7 @@ export default defineConfig({
 	clean: true,
 	dts: true,
 	entry: ["src/**/*.ts", "!src/**/*.test.*"],
-	format: "esm",
+	format: ["cjs", "esm"],
 	outDir: "lib",
 	sourcemap: true,
 });