Is it possible to have a library with koin version minor than application? Scenario: Imagine Glide is using Koin in version 2.x. And my app is using Koin 3.x.

You can use Shadow (https://imperceptiblethoughts.com/shadow/configuration/dependencies/) to hide your jar dependencies inside your library. This will embed the jar inside library, but it makes your library dependent only on that jar (i might not be describing this properly)

Is it safe do what I asked with shadow with Koin, @arnaud.giuliani?

never tested such tricky case to be honest 🤷