diff --git a/package.json b/package.json
index 2ea1f8d..4bbf1e5 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "build:types": "dts-bundle-generator -o dist/types.d.ts src/index.ts",
     "type-check": "tsc --noEmit",
     "lint": "eslint",
-    "format": "prettier --write '**/*.{ts,tsx,js,jsx,json,yml}'",
+    "format": "prettier $([ $CI ] && echo '--check' || echo '--write') '**/*.{js,jsx,ts,tsx,json,yml}'",
     "spec": "vitest run",
     "coverage": "vitest run --coverage",
     "verify": "npm run lint && npm run type-check && npm run format",