Dynamic Memory Updating in RAG: Lifelong Learning and Adaptation

Retrieval-Augmented Generation (RAG) has established itself as the standard for reducing hallucinations in Large Language Models (LLMs) by grounding generation in external knowledge. However, conventional RAG implementations rely on static vector stores, limiting their utility in dynamic environments where information evolves rapidly. This reliance on fixed knowledge bases restricts adaptability and long-term scalability. This paper synthesizes recent literature on RAG system design, specifically focusing on mechanisms for continuous learning. Building on frameworks by Zheng et al. and Zhang et al., we analyze architectures that support continuous memory addition, deletion, consolidation, and re-weighting. These mechanisms transition RAG from static retrieval to incremental learning, mirroring biological memory processes. Our analysis demonstrates that dynamic memory architectures outperform static systems in adaptability, robustness to distribution shifts, and long-term retention. We conclude that dynamic memory updating is not merely an optimization but a fundamental architectural requirement for sustaining lifelong learning in RAG systems.