Keeping dependencies updated is not just a hygiene task. It is part of keeping a codebase healthy, predictable, and easier to evolve. The longer a project stays on older versions, the more the upgrade starts to feel like a migration instead of a routine maintenance step. Major releases are usually where this becomes visible: APIs shift, behavior changes, and small incompatibilities accumulate across the app. Next.js, for example, documents upgrades with version-specific guides and codemods, which is a clear sign that these transitions are expected to require real review and code changes, not just a version bump.

I recently went through a full dependency update with the help of AI, and the biggest value was in planning: identifying what could break, mapping the affected files, and checking the changes step by step. That matters even more when security enters the picture. Recent TanStack advisories showed how quickly a dependency issue can turn into a serious operational problem, including a supply-chain compromise that affected 42 @tanstack/* packages and a separate Router-related advisory. The lesson is simple: staying current reduces the amount of technical debt you carry forward, makes urgent security fixes easier to apply, and lowers the chance that the next major update turns into a stressful fire drill.