Immutable Linux distributions are transforming how we think about system stability and security. This talk explores four such distributions: Fedora Silverblue, SnowflakeOS, rde, and Vanilla OS. Attendees will learn how immutable operating systems enhance system reliability through atomic updates and rollback capabilities, while understanding the trade-offs in terms of flexibility and customization. We'll examine how each distribution approaches package management, system configuration, and developer workflows. Whether you're a system administrator, developer, or Linux enthusiast, you'll come away understanding which immutable distribution might best suit your needs and how to contribute to these projects through code, documentation, or community support.