error Failed to fetch diff for react-native@0.60.5. Maybe it's not released yet?

```
react-native upgrade
info No version passed. Fetching latest...
info Fetching diff between v0.59.9 and v0.60.5...
error Failed to fetch diff for react-native@0.60.5. Maybe it's not released yet?
info For available releases to diff see: https://github.com/react-native-community/rn-diff-purge#version-changes

```
what's up with this ? why can't I upgrade ?

Thanks

