What type of hardware are you using: VPS bought online
What YunoHost version are you running: 12.1.15.1
What app is this about: Joplin
Describe your issue
I have 4G RAM and 6G swap on my VPS. I was able to install Joplin (a while ago on the same VPS with the same system specs), but now the upgrade requires 4G RAM:
This app requires 4G RAM to install/upgrade but only 1G is available right now.
Can this upgrade be done using swap or is there another way (besides upgrading my VPS to the next tier)? 
Share relevant logs or error messages
A new version is available for this app (3.4.7~ynh1), but some requirements are not met:
This app requires 4G RAM to install/upgrade but only 1G is available right now.