NodeSafeFactory uses existing deployments of Safe contract. Currently all the contract addresses are hardcoded and thus we are bound to Safe version 1.4. We can add more flexibility and support backward-compatible release from Safe by

• Introducing a NodeSafeFactory owner.
• Making all the SafeSuiteLib contracts be possibly updated by NodeSafeFactory owner, so the contract addresses can be updated in case of a new but backward-compatible release from Safe, or swapped for a different implementation of multisend/callback handler.