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Migrate .NET 9 to .NET 10

Skill

Upgrade a .NET 9 solution to .NET 10 and work through every breaking change along the way.

by .NETCoding & Dev Tools Listed Feb 3, 2026

Clone or download it from github.com, then drop the folder into ~/.claude/skills/ (Claude Code) or your agent's skills directory.

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About Migrate .NET 9 to .NET 10

From the official dotnet/skills repo.

This skill walks an agent through bumping net9.0 to net10.0 and then cleaning up the fallout: build errors from the new SDK, source and behavior changes in C# 14, ASP.NET Core 10, and EF Core 10, obsoletion warnings, and Dockerfile updates for the switch from Debian to Ubuntu base images.

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