Can't not install valet how should i do

[sheinminthu]

Changed current directory to /Users/shein/.composer
Using version ^2.18 for laravel/valet
./composer.json has been updated
Running composer update laravel/valet
Loading composer repositories with package information
Updating dependencies
Nothing to modify in lock file
Installing dependencies from lock file (including require-dev)
Nothing to install, update or remove
Generating autoload files
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