View source for Updating from an existing version

===Determining If Updates Exist=== <!--T:76-->
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Joomla will make a request to its update server over HTTPS and download an XML file provided by the Joomla project listing the latest available versions. The update server in use can be determined by going to {{rarr|System, Update,Joomla,Options}} and examining which update server is in use. You should use the ''Default'' update server to receive updates to your current major version of Joomla. Use ''Joomla Next'' when you want to upgrade your site to the next major version of Joomla — this is best done on a copy of your site to avoid any nasty surprises; not all third party extensions and templates will be compatible across major Joomla versions. The major version of Joomla is the first digit in the Joomla version, before the first dot. For example, the major version of Joomla 4.0.1 is 4.
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If Joomla cannot determine that an update is available please check the following:
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* The Joomla Update information is out of date in the database. Go to {{rarr|System,Update,Joomla,Check for Updates}}.
* The update sites information in Joomla is corrupt. Go to {{rarr|System,Update,Update Sites,Rebuild}}. Then go to {{rarr|System,Update,Joomla,Options}}. Select the Testing update channel. Select ''Save & Close''. Click on Options again. Select the ''Default'' or ''Joomla Next'' update channel — depending on your preference — and click on ''Save & Close''.
* Your host prevents making outbound HTTPS requests at all or restricts them to predefined allowed IP addresses. Please ask them to allow outbound HTTP requests to https://update.joomla.org. This is a CDN, meaning that the exact IP address will be different depending on where the world you are trying to access this URL from. Do tell your host; they will know what to do with this information.
* Your host may have an outdated SSL library which does not understand the modern TLS certificates used by the Joomla update CDN. Please ask your host about it.
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