How to upgrade magento 2.3.x to magento 2.3.4

I glade to here that Magento has produce new version its called 2.3.4 with some essential fixes and some new module which is required to in this compititive world.

There are 2 ways using that we can upgrade magento version.

1. Through Composer
2. Update 2.3.x to 2.3.4 via Web Setup Wizard

Note: Before update anything just backup current magento files and folders and Database so if there will come any problem and that not fix quickly then you can restore backup.

For Magento command you can check our Magento 2 Useful Command List

Through Composer

Step 1:  Put your store in Maintenance Mode

Step 2: Run the composer command to get the latest version (2.3.4)

Step 3: Run the composer update (this command will also fetch any available 3rd party extensions where updates are available)

Step 4: Clean the Magento Cache

php bin/magento cache:clean

Step 5: Remove cache & generated folder

Step 6: Upgrade Magento Database and Schema

Step 7: Compile Magento Code (If you’re running in Production Mode)

Step 8: Give permission

Step 9: Deploy Static Content (If you’re running in Production Mode)

Step 10: Clean the Magento Cache

Optional: Clear Varnish

Special Note:

If you get an error after upgradation like Specified invalid parent id (Dotdigitalgroup_Email::marketing_automation) than you can follow below step. This error already registered in Magento github directory you can check it here. They will solve in next release.
php bin/magento module:disable Dotdigitalgroup_Chat