Cocoapods Firebase pods update

问题

Good morning, i have a problem with updating my Firebase/Analytics and Firebase/Core pod.

My Podfile:

source 'https://github.com/CocoaPods/Specs.git'
source 'https://github.com/CocoaPods/Specs'
platform :ios, '10.0'

target 'Unity-iPhone' do
pod 'Firebase/Analytics', '5.15.0'
pod 'Firebase/Core', '5.15.0'
pod 'Firebase/Messaging', '5.1.0'
pod 'GoogleAppMeasurement', '5.3.0'
pod 'Google-Mobile-Ads-SDK', '~> 7.0'
end

if i run pod install i get the following output

Analyzing dependencies

[!] CocoaPods could not find compatible versions for pod "Firebase/Analytics":
  In Podfile:
    Firebase/Analytics (= 5.15.0)

None of your spec sources contain a spec satisfying the dependency: `Firebase/Analytics (= 5.15.0)`.

You have either:
 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
 * mistyped the name or version.
 * not added the source repo that hosts the Podspec to your Podfile.

Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default.

with pod outdated:

so i run pod update:

But 'Firebase/Analytics' remains on version 5.1.0 Where am i wrong? i have already try to install repo master several times and also gem