[google_sign_in] Update to GoogleSignIn-iOS 10

google_sign_in_ios depends on GoogleSignIn ~> 9.0, which (via GTMAppAuth 5) limits gtm-session-fetcher to < 4.0. This conflicts with packages that require gtm-session-fetcher 5.x, e.g. ARCore iOS SDK 1.56.0 (5.0.0..<6.0.0), the first version available via Swift Package Manager.

GoogleSignIn-iOS 10.0.0 allows gtm-session-fetcher 3.3.0..<6.0.0 (GTMAppAuth 6), so updating would resolve this. Note that 10.0.0 requires iOS 15.

@takumiito271

@takumiito271 Thanks for the report. routing to the team-ios for further investigation.

@takumiito271 Could you please share the dependency resolution error you encountered when using google_sign_in_ios alongside ARCore iOS SDK 1.56.0? This would help the team investigate the dependency conflict.

Could you please share the dependency resolution error you encountered when using google_sign_in_ios alongside ARCore iOS SDK 1.56.0?

// swift-tools-version:5.9
import PackageDescription

let package = Package(
  name: "Repro",
  platforms: [.iOS(.v15)],
  dependencies: [
    .package(url: "https://github.com/google/GoogleSignIn-iOS.git", "9.0.0"..<"10.0.0"),
    .package(url: "https://github.com/google-ar/arcore-ios-sdk.git", exact: "1.56.0"),
  ],
  targets: [
    .target(
      name: "Repro",
      dependencies: [
        .product(name: "GoogleSignIn", package: "GoogleSignIn-iOS"),
        .product(name: "ARCoreCloudAnchors", package: "arcore-ios-sdk"),
      ]
    ),
  ]
)

error: Dependencies could not be resolved because root depends on 'googlesignin-ios' 9.0.0..<10.0.0 and root depends on 'arcore-ios-sdk' 1.56.0.
'arcore-ios-sdk' is incompatible with 'googlesignin-ios' because 'googlesignin-ios' 9.2.0 depends on 'gtm-session-fetcher' 3.3.0..<4.0.0 and 'arcore-ios-sdk' 1.56.0 depends on 'gtm-session-fetcher' 5.0.0..<6.0.0.
'googlesignin-ios' {9.0.0..<9.2.0, 9.2.1..<10.0.0} practically depends on 'gtm-session-fetcher' 3.3.0..<4.0.0 because 'googlesignin-ios' 9.1.0 depends on 'gtm-session-fetcher' 3.3.0..<4.0.0.
'googlesignin-ios' {9.0.0..<9.1.0, 9.1.1..<9.2.0, 9.2.1..<10.0.0} practically depends on 'gtm-session-fetcher' 3.3.0..<4.0.0 because no versions of 'googlesignin-ios' match the requirement {9.0.1..<9.1.0, 9.1.1..<9.2.0, 9.2.1..<10.0.0} and 'googlesignin-ios' 9.0.0 depends on 'gtm-session-fetcher' 3.3.0..<4.0.0

Adding another real-world conflict with the same root cause, in case it helps prioritise: google_sign_in_ios 6.3.7 cannot be resolved together with firebase_messaging 17.0.0 (firebase-ios-sdk 13.0.0) under Swift Package Manager.

Resolver output from flutter build ios (SPM enabled; CocoaPods is not an option for us because sentry_flutter requires SPM):

Failed to resolve dependencies:
'firebase_messaging-17.0.0' depends on 'firebase-ios-sdk' 13.0.0 and
'google_sign_in_ios-6.3.7' depends on 'googlesignin-ios' 9.0.0..<10.0.0.
'googlesignin-ios' 9.x depends on 'gtm-session-fetcher' 3.3.0..<4.0.0
'firebase-ios-sdk' 13.0.0 depends on 'gtm-session-fetcher' 4.0.0..<6.0.0

Same cause as described above (GoogleSignIn 9 -> GTMAppAuth 5 caps gtm-session-fetcher below 4).

Note that just moving to GoogleSignIn-iOS 10.0.0 is not enough for Firebase 13: I tested the 10.0.0 manifest and it still fails, because GoogleSignIn-iOS 10.0.0 pins app-check 11.x while firebase-ios-sdk 13.0.0 requires app-check 12.x:

'firebase-ios-sdk' 13.0.0 depends on 'app-check' 12.0.0..<13.0.0

The change that allows app-check 11 and 12 is google/GoogleSignIn-iOS#626 ("Add SPM AppCheckCore 12.x support"), which is still open. So updating google_sign_in_ios to GoogleSignIn-iOS 10 will only unblock Firebase 13 users once a GoogleSignIn-iOS release that includes #626 ships.

For anyone hitting this now, the workarounds are staying on the Firebase 12 line (firebase_core 4.x / firebase_messaging 16.x / firebase_analytics 12.x) or vendoring google_sign_in_ios with its Package.swift pointed at a GoogleSignIn-iOS revision that contains #626.

A data point from the Firebase side, plus two details that I think change the scope of this.

1. Widening the SPM range is not sufficient on its own. GoogleSignIn-iOS 10.0.0 raises its own minimum to iOS 15 / macOS 12, while the plugin currently declares:

darwin/google_sign_in_ios/Package.swift: .iOS("13.0"), .macOS("10.15")
darwin/google_sign_in_ios.podspec: s.ios.deployment_target = '13.0', s.osx.deployment_target = '10.15'

SPM rejects a package whose dependency requires a higher platform minimum than the package itself declares, so the deployment targets have to move together with the version range. That makes this a breaking change for google_sign_in_ios — and therefore a coordinated major bump with google_sign_in — rather than the one-line dependency widening it looks like at first.

The four changes involved:

Package.swift  from: "9.0.0"                     ->  "9.0.0" ..< "11.0.0"
Package.swift  .iOS("13.0") / .macOS("10.15")    ->  .iOS("15.0") / .macOS("12.0")
podspec        'GoogleSignIn', '~> 9.0'          ->  '>= 9.0', '< 11.0'
podspec        ios 13.0 / osx 10.15              ->  ios 15.0 / osx 12.0

2. It will not unblock the firebase-ios-sdk 13 reports in this thread. We hit the same resolver error reported above (via firebase_remote_config 7.0.0 → firebase-ios-sdk 13.0.0) and carried the four changes above as a fork. The resolver then gets past gtm-session-fetcher and fails on AppCheck instead:

'firebase-ios-sdk' 13.0.0 depends on 'app-check' 12.0.0..<13.0.0 and
'googlesignin-ios' 10.0.0 depends on 'app-check' 11.0.0..<12.0.0

GoogleSignIn-iOS 10.0.0 (2026-09-04) predates AppCheck 12.0.0 (2026-09-23), so no current GoogleSignIn-iOS release can coexist with firebase-ios-sdk 13. That part is upstream of this package — filed as google/GoogleSignIn-iOS#655.

So this is still worth doing for the ARCore case in the original report. We have rolled back to the firebase-ios-sdk 12 generation in the meantime.

The main blocker remains about the latest firebase-ios-sdk 13.0.0 which we can't use for now.

That makes this a breaking change for google_sign_in_ios

Updating a plug-in's minimum OS versions to match the current Flutter minimum versions is not a breaking change, it just requires updating the min Flutter SDK version at the same time.

Getting the same version solving issue when compiling my app for ios/MacOs. gtm-session-fetcher version should be upgraded to 4.x

Error: An error occurred when adding Swift Package Manager integration:
  Error: Xcode failed to resolve Swift Package Manager dependencies:
2026-10-21 00:06:47.279 xcodebuild[55402:1245356] Writing error result bundle to
/var/folders/85/6jq8m3911fb_b671ymz6_v5r0000gn/T/ResultBundle_2026-21-10_12-06-0047 AM.xcresult
xcodebuild: error: Could not resolve package dependencies:
  Failed to resolve dependencies Dependencies could not be resolved because
  'firebase_storage-14.0.0' depends on 'firebase-ios-sdk' 13.0.0 and 'google_sign_in_ios-6.3.8'
  depends on 'googlesignin-ios' 9.0.0..<10.0.0.
'firebase-ios-sdk' is incompatible with 'googlesignin-ios' because 'googlesignin-ios' 9.2.0 depends
on 'gtm-session-fetcher' 3.3.0..<4.0.0 and 'firebase-ios-sdk' 13.0.0 depends on
'gtm-session-fetcher' 4.0.0..<6.0.0.
'googlesignin-ios' {9.0.0..<9.2.0, 9.2.1..<10.0.0} practically depends on 'gtm-session-fetcher'
3.3.0..<4.0.0 because 'googlesignin-ios' 9.1.0 depends on 'gtm-session-fetcher' 3.3.0..<4.0.0.
'googlesignin-ios' {9.0.0..<9.1.0, 9.1.1..<9.2.0, 9.2.1..<10.0.0} practically depends on
'gtm-session-fetcher' 3.3.0..<4.0.0 because no versions of 'googlesignin-ios' match the requirement
{9.0.1..<9.1.0, 9.1.1..<9.2.0, 9.2.1..<10.0.0} and 'googlesignin-ios' 9.0.0 depends on
'gtm-session-fetcher' 3.3.0..<4.0.0.

Encountered the same dependency resolution conflict when building for iOS with Swift Package Manager on Flutter 3.47 using firebase_performance: 0.12.1 (firebase-ios-sdk 13.1.1) and google_sign_in_ios: 6.3.8 (googlesignin-ios 9.0.0..<10.0.0):

xcodebuild: error: Could not resolve package dependencies:
  Failed to resolve dependencies Dependencies could not be resolved because 'firebase_performance-0.12.1' depends on
  'firebase-ios-sdk' 13.1.1 and 'google_sign_in_ios-6.3.8' depends on 'googlesignin-ios' 9.0.0..<10.0.0.
'firebase-ios-sdk' is incompatible with 'googlesignin-ios' because 'googlesignin-ios' 9.2.0 depends on
'gtm-session-fetcher' 3.3.0..<4.0.0 and 'firebase-ios-sdk' 13.1.1 depends on 'gtm-session-fetcher' 4.0.0..<6.0.0.
'googlesignin-ios' {9.0.0..<9.2.0, 9.2.1..<10.0.0} practically depends on 'gtm-session-fetcher' 3.3.0..<4.0.0
because 'googlesignin-ios' 9.1.0 depends on 'gtm-session-fetcher' 3.3.0..<4.0.0.
'googlesignin-ios' {9.0.0..<9.1.0, 9.1.1..<9.2.0, 9.2.1..<10.0.0} practically depends on 'gtm-session-fetcher'
3.3.0..<4.0.0 because no versions of 'googlesignin-ios' match the requirement {9.0.1..<9.1.0, 9.1.1..<9.2.0,
9.2.1..<10.0.0} and 'googlesignin-ios' 9.0.0 depends on 'gtm-session-fetcher' 3.3.0..<4.0.0.

Looking forward to flutter/packages#13306 being merged.

We're hitting this too: firebase_messaging 17.0.1 / firebase_core 5.1.0 (firebase-ios-sdk 13.1.1) with google_sign_in_ios 6.3.8, SwiftPM, Flutter 3.47.7, Xcode 26.6. Same gtm-session-fetcher resolver error as above.

A data point for flutter/packages#13306: I applied its Package.swift change ("9.0.0"..<"11.0.0", iOS 15 / macOS 12) to a local copy of google_sign_in_ios 6.3.8 through dependency_overrides, and flutter build ios now succeeds. SwiftPM resolved:

googlesignin-ios     10.1.0
gtm-session-fetcher  5.3.1
app-check            12.0.0
firebase-ios-sdk     13.1.1
gtmappauth           6.0.0

So with GoogleSignIn-iOS 10.1.0, which includes google/GoogleSignIn-iOS#626, the AppCheck conflict mentioned earlier no longer applies, and flutter/packages#13306 on its own is enough to unblock Firebase 13. I only tested a build, not a sign-in flow on a device.

In my case I'm getting this:

Firebase SDK requirement: firebase_remote_config-7.0.1 depends on firebase-ios-sdk 13.1.1, which strictly requires gtm-session-fetcher version 4.0.0..<6.0.0.
Google Sign-In requirement: google_sign_in_ios-6.3.5 depends on googlesignin-ios (e.g., v9.2.0), which strictly requires gtm-session-fetcher version 3.3.0..<4.0.0.

[google_sign_in] Allow GoogleSignIn-iOS 10 (flutter#13306)

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[google_sign_in] Update to GoogleSignIn-iOS 10 #194435

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[google_sign_in] Update to GoogleSignIn-iOS 10 #194435

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