The Basel Committee on Banking Supervision introduced stricter Basel III regulations after the 2008 financial crisis to strengthen banks' capital requirements and promote a more resilient banking sector. The key changes included higher minimum capital requirements, a capital conservation buffer, a countercyclical capital buffer, strengthened capital treatment for trading book exposures and securitizations, more stringent counterparty credit risk rules, and the introduction of a non-risk-based leverage ratio. The regulations aimed to reduce systemic risk, improve risk management practices, and promote a safer banking system overall.