CERTAIN researcher Timo Gros invites to the 9th Planning and Reinforcement Learning (PRL) Workshop at ICAPS 2025 in Melbourne. The event brings together the communities of automated planning and reinforcement learning to spark dialogue across theory, methods, and applications. Covering topics from model learning to multi-agent systems, the PRL Workshop explores how intelligent systems can make better, more reliable decisions over time, which is a cornerstone of trustworthy AI.