Xcodeproj: Can't get `pod update` to work on macOS Catalina

Can’t get pod update to work on macOS Catalina

JeffMacbookPro:Proj-iOS jefhai$ pod update

[!] Invalid `Podfile` file: [Xcodeproj] Unknown object version..

 #  from /Users/jefhai/Documents/git/Proj-iOS/Podfile:24
 #  -------------------------------------------
 #  
 >  project = Xcodeproj::Project.open "Proj.xcodeproj"
 #  project.targets.each do |t|
 #  -------------------------------------------

[!] [!] Xcodeproj doesn't know about the following attributes {"platformFilter"=>"ios"} for the 'PBXBuildFile' isa.
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new