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This article shows how onboarding newcomers helps to prevent skills obsolescence. While the literature focuses primarily on the development of skills, our article analyzes the factors that render skills obsolete and ways to overcome this. The case study of an establishment within the SNCF Group allows us to identify the skills that have become obsolete and the organizational and HR factors that produced this dynamic. Our data also show that onboarding newcomers allows them to be considered as participants in a new organizational strategy that legitimizes them through their role in disseminating knowledge. Finally, our results show that the diversity of profiles (age, experience, personality traits, etc.) is a crucial factor in the renewal of skills because it allows the development of “learning agility,” promoting co-commitment and co-responsibility. Our article enriches the literature by identifying onboarding as a strategic HR lever to prevent skills obsolescence.