I'm using react-native and I am trying to update the pods by using

```
pod update

```

But it updates nothing. However, when I use

```
pod outdated

```

It shows this

```
    Updating spec repo `master`
    $ /usr/bin/git -C /Users/IG/.cocoapods/repos/master fetch origin --progress
    remote: Counting objects: 15, done.        
    remote: Compressing objects: 100% (14/14), done.        
    remote: Total 15 (delta 11), reused 0 (delta 0), pack-reused 0        
    From https://github.com/CocoaPods/Specs
        1bb3a72da66..f6d4f6f0e14  master     -> origin/master
    $ /usr/bin/git -C /Users/IG/.cocoapods/repos/master rev-parse --abbrev-ref HEAD
    master
    $ /usr/bin/git -C /Users/IG/.cocoapods/repos/master reset --hard origin/master
    HEAD is now at f6d4f6f0e14 [Add] ScanbotSDK 0.0.2
    Analyzing dependencies
    The color indicates what happens when you run `pod update`
    <green>      - Will be updated to the newest version
    <blue>   - Will be updated, but not to the newest version because of specified version in Podfile
    <red>        - Will not be updated because of specified version in Podfile

    The following pod updates are available:
    - Firebase 3.17.0 -> (unused) (latest version 4.13.0)
    - FirebaseAnalytics 3.9.0 -> 3.9.0 (latest version 4.2.0)
    - FirebaseCore 3.6.0 -> 3.6.0 (latest version 4.0.20)
    - FirebaseInstanceID 1.0.10 -> 1.0.10 (latest version 2.0.10)
    - FirebaseMessaging 1.2.3 -> 1.2.3 (latest version 2.2.0)
    The following pods are deprecated:
    - Google

```

But my podfile doesn't specify any version:

```
platform :ios, '8.0'
use_frameworks!

target 'MyApp' do
    pod 'Google/SignIn'
    pod 'Firebase/Core'
    pod 'Firebase/Messaging'
end

```

I have react-native 0.47.2
xcode 9.2
cocoapods 1.5.0