Managing module dependencies

When Go code uses external packages, those packages are distributed as modules and become dependencies, and Go provides dependency management tools that help keep applications secure while incorporating them. Dependency changes are made with Go commands, which edit the go.mod file so its contents stay valid; go help command-name, as in go help mod tidy, gives command-line reference. The typical workflow is to locate useful packages on pkg.go.dev, import them, enable dependency tracking by putting the code in its own module with go mod init — whose argument is the module path, ideally the repository location of the source — and then upgrade or downgrade dependency versions over time. Publishing is decentralized: developers make modules available from their own repositories with version numbers, and a version numbering convention conveys stability and backward compatibility guarantees. Making an editor or IDE aware of Go modules eases the work. Scope: Go. Reviewed October 4, 2026.