diff --git a/packages/google_sign_in/google_sign_in/CHANGELOG.md b/packages/google_sign_in/google_sign_in/CHANGELOG.md
index 1f0be2e237b2..6107560ce610 100644
--- a/packages/google_sign_in/google_sign_in/CHANGELOG.md
+++ b/packages/google_sign_in/google_sign_in/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 5.1.1
+
+* Update minimum Flutter SDK to 2.5 and iOS deployment target to 9.0.
+
 ## 5.1.0
 
 * Add reAuthenticate option to signInSilently to allow re-authentication to be requested
diff --git a/packages/google_sign_in/google_sign_in/README.md b/packages/google_sign_in/google_sign_in/README.md
index 6ed21c0fedd2..f3787474eeef 100644
--- a/packages/google_sign_in/google_sign_in/README.md
+++ b/packages/google_sign_in/google_sign_in/README.md
@@ -27,6 +27,8 @@ Otherwise, you may encounter `APIException` errors.
 
 ### iOS integration
 
+This plugin requires iOS 9.0 or higher.
+
 1. [First register your application](https://firebase.google.com/docs/ios/setup).
 2. Make sure the file you download in step 1 is named
    `GoogleService-Info.plist`.
diff --git a/packages/google_sign_in/google_sign_in/example/pubspec.yaml b/packages/google_sign_in/google_sign_in/example/pubspec.yaml
index 0379b9065333..dfd942d3d438 100644
--- a/packages/google_sign_in/google_sign_in/example/pubspec.yaml
+++ b/packages/google_sign_in/google_sign_in/example/pubspec.yaml
@@ -3,8 +3,8 @@ description: Example of Google Sign-In plugin.
 publish_to: none
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
-  flutter: ">=1.12.13+hotfix.4"
+  sdk: ">=2.14.0 <3.0.0"
+  flutter: ">=2.5.0"
 
 dependencies:
   flutter:
diff --git a/packages/google_sign_in/google_sign_in/ios/google_sign_in.podspec b/packages/google_sign_in/google_sign_in/ios/google_sign_in.podspec
index a0b73276fafa..270ca274f3e4 100644
--- a/packages/google_sign_in/google_sign_in/ios/google_sign_in.podspec
+++ b/packages/google_sign_in/google_sign_in/ios/google_sign_in.podspec
@@ -19,7 +19,7 @@ Enables Google Sign-In in Flutter apps.
   s.dependency 'GoogleSignIn', '~> 5.0'
   s.static_framework = true
 
-  s.platform = :ios, '8.0'
+  s.platform = :ios, '9.0'
 
   # GoogleSignIn ~> 5.0 does not support arm64 simulators.
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64' }
diff --git a/packages/google_sign_in/google_sign_in/pubspec.yaml b/packages/google_sign_in/google_sign_in/pubspec.yaml
index c9931fd276f4..aa0a686776fb 100644
--- a/packages/google_sign_in/google_sign_in/pubspec.yaml
+++ b/packages/google_sign_in/google_sign_in/pubspec.yaml
@@ -3,11 +3,11 @@ description: Flutter plugin for Google Sign-In, a secure authentication system
   for signing in with a Google account on Android and iOS.
 repository: https://github.com/flutter/plugins/tree/master/packages/google_sign_in/google_sign_in
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+google_sign_in%22
-version: 5.1.0
+version: 5.1.1
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
-  flutter: ">=2.0.0"
+  sdk: ">=2.14.0 <3.0.0"
+  flutter: ">=2.5.0"
 
 flutter:
   plugin: