To upgrade Laravel 5.1 to latest Laravel version, you will have to go through each version between 5.1 and latest version, which is 5.6. It is possible that there were few functions that were deprecated in 5.5 but that might not be mentioned in 5.6 upgrade guide. This is why you will have to read all the upgrade manuals. Also, you should know that to upgrade to 5.6, you will need latest PHP version, which is 7.2. For this, you must host Laravel app on provider that supports latest PHP version. Otherwise you wont be able to upgrade your Laravel app.
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To upgrade Laravel 5.1 to latest Laravel version, you will have to go through each version between 5.1 and latest version, which is 5.6. It is possible that there were few functions that were deprecated in 5.5 but that might not be mentioned in 5.6 upgrade guide. This is why you will have to read all the upgrade manuals. Also, you should know that to upgrade to 5.6, you will need latest PHP version, which is 7.2. For this, you must host Laravel app on provider that supports latest PHP version. Otherwise you wont be able to upgrade your Laravel app.