go get获取的包为什么不是最新版本

Question

比如我用命名
go get github.com/kataras/iris
获取的是11.1.1版本，但是最新的是12.1.8版本，这是为什么

Answer 1

有一个 -u 的参数附上

Answer 2

go help get

The -u flag instructs get to use the network to update the named packages
and their dependencies. By default, get uses the network to check out
missing packages but does not use it to look for updates to existing packages.