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Upgrading software packages on a Linux system is essential for security, performance, and feature enhancements. However, this process can sometimes become a double-edged sword as new package versions might introduce breaking changes or compatibility issues. Fortunately, containerization offers a robust solution for testing package upgrades in isolated environments, minimizing the risk to production systems. This blog explores how to use containerization to test package upgrades with specific instructions for popular Linux package managers: apt, dnf, and zypper. Containerization is a lightweight alternative to full machine virtualization that involves encapsulating an application in a container with its own operating environment.