The Ethereum 2.0 upgrade enhances smart contract security significantly. The shift to Proof of Stake (PoS) reduces energy consumption and strengthens network security, minimizing risks like Sybil attacks. Improved protocol designs enable better detection and penalization of malicious activities, ensuring robust smart contract integrity. Enhanced cryptographic techniques secure transactions, while advanced auditing tools improve vulnerability detection. Sharding boosts scalability, reducing congestion and gas costs, which supports more reliable contract execution. Account abstraction simplifies wallet security, reducing risks of key loss. These upgrades foster greater trust in decentralized applications, making smart contracts more secure and resilient.