# v5 Migration Guide: Steps to Upgrade from v4 Migrating to the latest version of our package is straightforward and involves a few key changes to ensure compatibility and take advantage of new features. Please follow the steps below to complete your migration. ## Configuration Changes ### 1. Config File Rename The configuration file has been renamed to `meta-pixel`. Please update any references to the old config file in your project. ### 2. Environment Variable Prefix Change Replace the `FACEBOOK_` prefix in your environment variables with `META_`. For example, change `FACEBOOK_PIXEL_ID` to `META_PIXEL_ID`. ## Feature Additions ### 3. Advanced Matching Enabled We have added a new feature `advanced_matching_enabled` to the configuration file, which is enabled by default. This feature enhances user tracking accuracy. ## Middleware Update ### 4. Middleware Name Update The middleware name has been updated to `MetaPixelMiddleware`. Update your middleware references accordingly. ## Facade Updates ### 5. Facade Call Changes All facade calls should now be made to `MetaPixel` instead of the previous facade name. ## Syntax Updates in HTML ### 6. Head and Body Tag Names Update the head and body tags in your HTML files using the new syntax for better integration: ```html

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