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Previously, when the go command found a problem with go.mod or go.sum like a missing require directive or a missing sum, it would attempt to fix the problem automatically. No automatic changes to go.mod and go.sum

If there is a problem preventing you from migrating, please consider filing an issue or an experience report. If you have projects that do not build in module-aware mode, now is the time to migrate. In other words, Go 1.17 will ignore GO111MODULE. We plan to drop support for GOPATH mode in Go 1.17. Note that you can set GO111MODULE and other variables permanently with go env -w: go env -w GO111MODULE=auto You can also set GO111MODULE to auto to enable module-aware mode only when a go.mod file is present in the current directory or any parent directory. It’s still possible to build packages in GOPATH mode by setting the GO111MODULE environment variable to off. This is a big step toward using modules in all projects. The go command now builds packages in module-aware mode by default, even when no go.mod is present. The release notes describe these changes briefly, but let’s explore a few of them in depth.

This release has a lot of new features, especially for modules. The Go Blog New module changes in Go 1.16