# security-checker > Check if a PHP application uses dependencies with known security vulnerabilities. > More information: . - Look for security issues in the project dependencies (based on the composer.lock file in the current directory): `security-checker security:check` - Use a specific composer.lock file: `security-checker security:check {{path/to/composer.lock}}` - Return results as a JSON object: `security-checker security:check --format=json`