Keeping .NET applications updated and secure while maintaining performance is a challenge. Legacy applications built on .NET Framework 4.x require upgrades to .NET Core or .NET 6+ for better performance and support. Managing backward compatibility, fixing security vulnerabilities, and integrating new features without disrupting existing functionality is crucial. Dot Net Development Company adopt CI/CD pipelines, automated testing, and version control systems (like Git) to streamline updates. Regular patching, dependency updates, and monitoring tools like Azure Monitor help ensure applications remain secure and up to date.