Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.3.0"

I have uploaded my laravel project to aws hosting when I go to ip address of ec2 instance it give me this error

Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.3.0".

I check php version current version 7.3 I dont know what actually need to do . First the version was 7.4 then i downgrade it to 7.3

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