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I'm trying to upgrade my Magento installation but experiencing problems with the process:

I was trying to update my site to the latest release as advised and I did so via the command line but I ran out of memory trying to do so.

Commands I ran were:

composer require magento/product-community-edition 2.2.3 --no-update
composer update

It was running fine but then a fatal error occurred:

Updating magento/magento2-base (2.2.2 => 2.2.3): Downloading (90%)
mmap() failed: [12] Cannot allocate memory

mmap() failed: [12] Cannot allocate memory

Fatal error: Out of memory (allocated 848302080) (tried to allocate 14680096 bytes) in phar:///usr/local/bin/composer.phar/src/Comp

Any ideas as my RAM allocation is fixed to 768? (I tried boosting it already).
I'm trying to upgrade to 2.2.3 from 2.2.2.

Thank you so much for any advice you may have.

Try:

php -d memory_limit=2048M composer require magento/product-community-edition 2.2.3 --no-update

php -d memory_limit=2048M composer update

If this fails go for memory_limit=-1.

If you haven't linked composer to your users bash, then replace composer with $(which composer).
It will return the path to the composer executable in your server. For example: /usr/local/bin/composer and the command will look like:

php -d memory_limit=2048M /usr/local/bin/composer require magento/product-community-edition 2.2.3 --no-update composer update

Same goes for php. If you got multiple php versions you should use the php7 version. Run $which php and it will return the paths that php in installed in. The parenthesis just execute the return as well so you can use them in commands like the one i gave you.
Please do this with care. Open a second terminal and monitor your processes, try htop, for possible memory leaks(so you can kill the processes with kill $pid of the memory eating one).

As for the hard limit you face.
What kind of webserver are you using and what php version/package for php code?
What kind of values exist on your php.ini and if you are using php-fpm on your fpm-pool for this user?

Magento 2 example configurations for both apache and nginx set the value for memory limit via .htaccess, .user.ini or FastCGI memory_limit to 768 and might be overriding your values.

If you are on a shared hosting with many restriction then try this:
find - /name php.ini
Find the one that fits your php-version.
Edit this file and set memory_limit=2048M or memory_limit=-1. DO NOT FORGET TO REVERT THE CHANGE AFTER YOU ARE DONE.

If you are using Apache then:

• create a php.ini file in your Magento installation root folder(copy
  php's default we found above. cp /path/to/php7/etc/php.ini
  /path/to/magento/root/php.ini).




• edit memory_limit value as said above.




• create .htaccess file on your Magento installation root folder and
  add this line SetEnv PHPRC /path/to/magento/root/php.ini.

Your help was close thanks. Not sure why I needed to state composer.phar but there we go. I can follow copy and paste for next time! Commands I ran were:

/usr/local/php70/bin/php-cli composer.phar require magento/product-community-edition 2.2.3 --no-update

./composer.json has been updated

/usr/local/php70/bin/php-cli composer.phar update