What now always works for me now is (after weeks of real pain with SPM behind a corporate proxy): On the terminal xcodebuild -scmProvider system -resolvePackageDependencies -disablePackageRepositoryCache -workspace MyProject.xcworkspace -scheme MyScheme On XCode after the xcodebuild finishes XCode - File - Packages - Resolve Package Versions. I hope this is of any help.

Its really annoying