example error

[spiderman16888]

[!] CocoaPods could not find compatible versions for pod "Firebase/Auth":
In snapshot (Podfile.lock):
Firebase/Auth (= 10.3.0)

  In Podfile:
    firebase_auth (from `.symlinks/plugins/firebase_auth/ios`) was resolved to 4.17.9, which depends on
      Firebase/Auth (= 10.22.0)

Error: CocoaPods's specs repository is too out-of-date to satisfy dependencies.
To update the CocoaPods specs, run:
pod repo update

Error: Error running pod install

[JBtronic]

pod repo update will solve your problem!

I encounter this issue when I updated google_mobile_ads from 4.0.0 to 5.0.0.
Pod repo update solve it for me & as you can see it changes MinimumOSVersion in info.plist from 11 to 12.

Still if it does not work then

first delete pod folder, podfile, podfile.lock and then
flutter clean
flutter pub get
In podfile change => platform : ios, '14.0', //Uncomment this
cd ios
pod install
cd ..
flutter build ios