I only know of iOS, but here's what I try to do

- Reduce the use of dependencies to the minimum (I'm bad at this) - set version compatibility in my Cartfile / Podfile - when new breaking versions of Swift came out, suggest to my client a 2 / 3 mission solely focused on upgrading their app and it's dependencies (otherwise it will probably make their next last minute super-urgent-right-now feature needlessly long and complex to develop)

But I'd also willingly take any advice on this

Edit: also, semi-solved this for my JS work using automated dependency update services, like dependabot, coupled with unit / integration tests, but still haven't found a similar service for Swift