I updated magento to latest version 2.4.5 but it shows Magento 2.5.0 in back office part.
Is there anyone who can help me to find out why and Thanks.
well) maybe you got some special Magento version)
but you could check your version in composer.json file or run grep -r '2.4.5' magento_folder/*
Regully some freelancers don't upgrade Magento) they only change the Magento version in composer.json
to avoid getting into such trouble and choose the right team to work with.
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