Debian 9 (1 GB RAM, 25 GB storage)
Apache
MariaDB
PHP 7.2

Composer and Laravel installed successfully

Then, attempted to add a package with composer …
ran following line in Putty
composer require mobiledetect/mobiledetectlib

returned the following…

Using version ^2.8 for mobiledetect/mobiledetectlib
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)

mmap() failed: [12] Cannot allocate memory

mmap() failed: [12] Cannot allocate memory
PHP Fatal error: Out of memory (allocated 878714880) (tried to allocate 4096 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/Solver.php on line 223

Fatal error: Out of memory (allocated 878714880) (tried to allocate 4096 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/Solver.php on line 223

Checked for the mobiledetect folder in /var/www/domainname/html/projectname/vendor but no folder there

Currently have 1 GB RAM in DigitalOcean, do I need to up it to 2 GB RAM for composer to run updates properly?

I ran the command …
php -r “echo iniget(‘memorylimit’).PHP_EOL;”
and -1 was returned which means unlimited

I checked the php.ini file and found…
; Maximum amount of memory a script may consume (128MB)
; http://php.net/memory-limit
memory_limit = -1

I used the 'top’ command to view that only 1 % of CPU is in use

and free -m returns
total used free shared buff/cache available
Mem: 996 134 800 21 60 750

I read that composer increases internal memory to 1.5 GB here https://getcomposer.org/doc/articles/troubleshooting.md#memory-limit-errors

Any suggestions would be appreciated.