Introduction/Guides/UpgradingUpgrade GuidesLearn how to upgrade to the latest versions of Next.js following the versions-specific guides:CodemodsUse codemods to upgrade your Next.js codebase when new features are released.Version 14Upgrade your Next.js Application from Version 13 to 14.Version 15Upgrade your Next.js Application from Version 14 to 15.VitestLearn how to set up Vitest with Next.js for Unit Testing.CodemodsUse codemods to upgrade your Next.js codebase when new features are released.