Can anyone please point out what I am doing wrong.

• Xcode – Version 15.3
• iOS – Sonoma Version 14.5 , apple M3Max
• cocoapods – Version 1.15.2

below is the pod file.

# Uncomment the next line to define a global platform for your project
platform :ios, '12.0'

target 'connectdots' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!

  # Pods for connectdots
  pod ‘Firebase/Core’, '11.5.0'
  pod ‘Firebase/AdMob’, '11.5.0'
  
end

below is the error I got when I run pod install --repo update

[!] CocoaPods could not find compatible versions for pod "Firebase/Core":
  In Podfile:
    Firebase/Core (= 11.5.0)

None of your spec sources contain a spec satisfying the dependency: `Firebase/Core (= 11.5.0)`.

You have either:
 * mistyped the name or version.
 * not added the source repo that hosts the Podspec to your Podfile.

Firebase/Core and Firebase/AdMob need to be updated to latest version

I tried some other solutions found on the internet, but nothing is solving my problem.