"npx cap add ios" failed

[shinriyo]

hello. I tried the command, npx cap add ios.
and, the failed message was as follows.

✔ Installing iOS dependencies in 7.67s
✔ Adding native xcode project in: /Users/shinriyo/development/phaser_apps/my-game/ios in 82.58ms
✔ add in 7.76s
✔ Copying web assets from www to ios/App/public in 22.80ms
✔ Copying native bridge in 3.97ms
✔ Copying capacitor.config.json in 1.76ms
✔ copy in 36.46ms
✔ Updating iOS plugins in 3.65ms
  Found 0 Capacitor plugins for ios:
✖ Updating iOS native dependencies:
✖ update ios:
[error] Analyzing dependencies
Fetching podspec for `Capacitor` from `../../node_modules/@capacitor/ios`
Fetching podspec for `CapacitorCordova` from `../../node_modules/@capacitor/ios`
[!] CocoaPods could not find compatible versions for pod "Capacitor":
  In Podfile:
    Capacitor (from `../../node_modules/@capacitor/ios`)

Specs satisfying the `Capacitor (from `../../node_modules/@capacitor/ios`)` dependency were found, but they required a higher minimum deployment target.

I tried sudo gem update
And, I tried

rm -r iOS
npx cap add ios
npx cap sync

however, never resolved.