Cairo Upgradeability

Overview

Explain how Starknet upgrades work and the safeguards commonly used.

Quick Use

• Read references/upgradeability.md before answering.
• Mention replaceclasssyscall and access control.
• Suggest proxy patterns for more flexible upgrades.

Response Checklist

• Use a protected upgrade entry point that validates the new class hash.
• Explain that upgrades replace the class hash of an instance.
• Note that storage is preserved across upgrades.

Example Requests

• "How do I upgrade a Starknet contract?"
• "What does replaceclasssyscall do?"
• "Why do I need access control for upgrades?"