laravel queue:work out of memory

When I run command in terminal

php artisan queue:work

I got Error mmap() failed: [12] Cannot allocate memory PHP Fatal error: Out of memory (allocated 10303311872) (tried to allocate 262144 bytes) in /var/www/html/grubily/vendor/illuminate/container/Container.php on line 575

mmap() failed: [12] Cannot allocate memory PHP Fatal error: Out of memory (allocated 10303311872) (tried to allocate 262144 bytes) in /var/www/html/grubily/vendor/laravel/lumen-framework/src/Concerns/RegistersExceptionHandlers.php on line 65

My Droplet Configuration is

8 GB Memory / 40 GB Disk / NYC3 - Ubuntu WordPress 4.7 on 16.04

Also I created swap file

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