The 20th International Conference on Availability, Reliability and Security ("ARES 2025 - The International Dependability Conference") will be organized in Ghent, Belgium, from August 11-14, 2025. ARES highlights the various aspects of dependability – with special focus on the crucial linkage between availability, reliability and security. ARES aims at a full and detailed discussion of the research issues of dependability as an integrative concept that covers amongst others availability, safety, confidentiality, integrity, maintainability and security in the different fields of applications. ARES emphasizes the interplay between foundations and practical issues of dependability in emerging areas such as e-government, m-government, location-based applications, ubiquitous computing, autonomous computing, chances of grid computing etc. ARES is devoted to the critical examination and research challenges of the various aspects of Dependable Computing and the definition of a future road map. The ARES 2025 proceedings will be published in Springer Lecture Notes on Computer Science. The extended submission deadline is March 11, 2025 AoE, the author notification date is May 02, 2025. See https://2025.ares-conference.eu/ for more information and the full call for papers.