How to know the minimum deployment target a pod needs?

I'm using firebase_app_check in my app and when I run

pod install

It gives me an error:

[!] CocoaPods could not find compatible versions for pod "Firebase/AppCheck": In Podfile: firebase_app_check (from .symlinks/plugins/firebase_app_check/ios) was resolved to 0.0.6-4, which depends on Firebase/AppCheck (~> 8.10.0)

Specs satisfying the Firebase/AppCheck (~> 8.10.0) dependency were found, but they required a higher minimum deployment target.

I have the following in my Podfile

platform :ios, '10.0'

and as I read the firebase_app_check.podspec.json file, it mentions the deployment target must be 9.0 or greater:

"platforms": {
  "ios": "9.0"
}

But if I increase the minimum deployment target to 11.0, it works. So, where and how can I know what's the minimum deployment target a dependency need?

Check the published podspec to see the definitive version. For example, you can see that version 8.10.0 of Firebase/AppCheck requires iOS 11.0 here.

For Firebase/AppCheck in particular, the podspec has been updated here to support installation back to iOS 9 and that update will release with 8.11.0 next week.