I was updating my version of gocloud.dev from 0.24.0 to 0.30.0, and I see that it has increased the length of my go.sum file by 2,600+ lines! There seems to be some issue with how you're doing upgrades where old versions never drop out of the go.sum file. For example, there are 40 different versions of cloud.google.com/go listed in my go.sum file, which all seem to be copied over from yours.