If you are already using BLT via Composer, you can update to the latest version of BLT using composer.
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To update to the latest version of BLT that is compatible with your existing dependencies, run the following commands:
composer update acquia/blt --with-all-dependencies
This will cause Composer to update all of your dependencies (in accordance with your version constraints) and permit the latest version of BLT to be installed.
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Check the release information to see if there are special update instructions for the new version.
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Review and commit changes to your project files.
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Rarely, you may need to refresh your local environment via
blt setup
. This will drop your local database and re-install Drupal.