Dear colleagues, We are pleased to announce the 21st Workshop on Spoken Dialogue Systems for PhDs, PostDocs & New Researchers (YRRSDS 2025), which will take place on 28–29 August 2025 at Avignon Université - Campus Hannah Arendt, Avignon, France. Website: https://sites.google.com/view/yrrsds2025 This annual workshop provides a friendly forum for junior researchers to present their work, exchange ideas, and build collaborative networks within the spoken dialogue systems community. Topics of Interest include (but are not limited to): - Models of dialogue: statistical, symbolic, and hybrid approaches - Evaluation methodology for dialogue systems - Semantics, pragmatics, and context in dialogue systems - Incremental spoken dialogue systems - Situated interaction with virtual and robotic agents - Psycholinguistic influences on dialogue system design - Establishing social relationships and engagement with the user - Data collection and dataset sharing for statistical models - Industry development cycles, requirements, and applications Important Dates: Extended submission deadline: 10 July 2025 (Please note: this is an extension of the original 15 June deadline) Notification of acceptance: 15 July 2025 (Please note: this is an extension of the original 6 July deadline) We warmly invite PhD students, postdoctoral researchers, and early-career scholars to submit their ongoing or completed work. We look forward to receiving your submissions and seeing you in Avignon, The YRRSDS 2025 Organizing Committee