diff --git a/package.json b/package.json
index 0a4230c..f81680a 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "typings": "dist/index.d.ts",
   "type": "module",
   "scripts": {
-    "build": "esbuild src/index.ts --bundle --platform=neutral --outdir=dist --out-extension:.js=.js --external:crypto && tsc --emitDeclarationOnly --outDir dist",
+    "build": "esbuild src/index.ts --bundle --platform=neutral --outdir=dist --out-extension:.js=.js --external:crypto --format=cjs && tsc --emitDeclarationOnly --outDir dist",
     "test": "vitest run",
     "test:watch": "vitest",
     "lint:check": "eslint '**/*.{js,ts}'",