Migrate Dotnet10 To Dotnet11

This handles the tedious work of upgrading a .NET 10 codebase to .NET 11, including all the breaking changes that come with C# 15, runtime updates, and library changes. It walks through updating target frameworks, fixing build errors from new compiler rules (like span collection expression safe-context changes), addressing EF Core and ASP.NET Core breaking changes, and updating your CI/CD setup. The workflow is methodical with commits at logical boundaries, and it pulls from loaded reference docs covering everything through Preview 3. Use it when you're actually migrating an existing net10.0 project, not for greenfield work or cosmetic refactoring. The skill assumes you already have the .NET 11 SDK installed and starts from there.

skills.sh installs: 4.1K
GitHub stars: 5.9K
last updated: Aug 21, 2026

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Install

$ npx -y skills add dotnet/skills --skill migrate-dotnet10-to-dotnet11 --agent claude-code

Installs into .claude/skills of the current project.

Files

.NET 10 → .NET 11 Migration

Migrate a .NET 10 project or solution to .NET 11, systematically resolving all breaking changes. The outcome is a project targeting net11.0 that builds cleanly, passes tests, and accounts for every behavioral, source-incompatible, and binary-incompatible change introduced in .NET 11.

Note: .NET 11 is currently in preview. This skill covers breaking changes documented through Preview 3.

When to Use

Upgrading TargetFramework from net10.0 to net11.0
Resolving build errors or new warnings after updating the .NET 11 SDK
Adapting to behavioral changes in .NET 11 runtime, ASP.NET Core 11, or EF Core 11
Updating CI/CD pipelines, Dockerfiles, or deployment scripts for .NET 11
Fixing C# 15 compiler breaking changes after SDK upgrade