diff --git a/.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml b/.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml
index 77723218db5..d684c25d5bd 100644
--- a/.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml
+++ b/.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml
@@ -54,6 +54,7 @@ body:
         - Authentication
         - Crashlytics
         - Database
+        - Data Connect
         - DynamicLinks
         - Firestore
         - Functions
diff --git a/.github/workflows/auth.yml b/.github/workflows/auth.yml
index a65db1340c8..ffb858b589b 100644
--- a/.github/workflows/auth.yml
+++ b/.github/workflows/auth.yml
@@ -221,7 +221,7 @@ jobs:
     env:
       plist_secret: ${{ secrets.GHASecretsGPGPassphrase1 }}
       signin_secret: ${{ secrets.GHASecretsGPGPassphrase1 }}
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/core.yml b/.github/workflows/core.yml
index d3ac22b6b9b..ebd5bdfb3f6 100644
--- a/.github/workflows/core.yml
+++ b/.github/workflows/core.yml
@@ -22,16 +22,19 @@ jobs:
       matrix:
         # TODO: macos tests are blocked by https://github.com/erikdoe/ocmock/pull/532
         target: [ios, tvos, macos --skip-tests, watchos]
-        os: [macos-14]
-        xcode: [Xcode_15.2, Xcode_16]
-    runs-on: ${{ matrix.os }}
+        build-env:
+          - os: macos-14
+            xcode: Xcode_15.2
+          - os: macos-15
+            xcode: Xcode_16.1
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Build and test
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseCore.podspec --platforms=${{ matrix.target }}
 
@@ -72,22 +75,22 @@ jobs:
             xcode: Xcode_15.4
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: tvOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: macOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: watchOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: catalyst
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: visionOS
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/core_internal.yml b/.github/workflows/core_internal.yml
index c9db19c0b3d..9846172135a 100644
--- a/.github/workflows/core_internal.yml
+++ b/.github/workflows/core_internal.yml
@@ -18,16 +18,19 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos, macos, watchos]
-        os: [macos-14]
-        xcode: [Xcode_15.2, Xcode_16]
-    runs-on: ${{ matrix.os }}
+        build-env:
+          - os: macos-14
+            xcode: Xcode_15.2
+          - os: macos-15
+            xcode: Xcode_16.1
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Build and test
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseCoreInternal.podspec --platforms=${{ matrix.target }}
 
@@ -68,22 +71,22 @@ jobs:
             xcode: Xcode_15.4
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: tvOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: macOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: watchOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: catalyst
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: visionOS
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/dynamiclinks.yml b/.github/workflows/dynamiclinks.yml
index 777cba16742..61439d6cc3c 100644
--- a/.github/workflows/dynamiclinks.yml
+++ b/.github/workflows/dynamiclinks.yml
@@ -22,8 +22,11 @@ jobs:
 
     strategy:
       matrix:
-        os: [macos-14]
-        xcode: [Xcode_15.2, Xcode_16]
+        include:
+          - os: macos-14
+            xcode: Xcode_15.2
+          - os: macos-15
+            xcode: Xcode_16.1
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
@@ -70,7 +73,7 @@ jobs:
           - os: macos-14
             xcode: Xcode_15.4
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/functions.yml b/.github/workflows/functions.yml
index 49d26b29a5c..5b7dc6c26cc 100644
--- a/.github/workflows/functions.yml
+++ b/.github/workflows/functions.yml
@@ -30,17 +30,17 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos, macos, watchos]
-        include:
+        build-env:
           - os: macos-14
             xcode: Xcode_15.2
           - os: macos-15
             xcode: Xcode_16.1
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     # The integration tests are flaky on Xcode 15 so only run the unit tests. The integration tests still run with SPM.
diff --git a/.github/workflows/mlmodeldownloader.yml b/.github/workflows/mlmodeldownloader.yml
index 81da1ab1a83..39d4ba45558 100644
--- a/.github/workflows/mlmodeldownloader.yml
+++ b/.github/workflows/mlmodeldownloader.yml
@@ -22,9 +22,12 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos, macos, watchos]
-        os: [macos-14]
-        xcode: [Xcode_15.2, Xcode_16]
-    runs-on: ${{ matrix.os }}
+        build-env:
+          - os: macos-14
+            xcode: Xcode_15.2
+          - os: macos-15
+            xcode: Xcode_16.1
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
@@ -38,7 +41,7 @@ jobs:
         scripts/decrypt_gha_secret.sh scripts/gha-encrypted/MLModelDownloader/GoogleService-Info.plist.gpg \
           FirebaseMLModelDownloader/Tests/Integration/Resources/GoogleService-Info.plist "$plist_secret"
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Build and test
       run: ([ -z $plist_secret ] || scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseMLModelDownloader.podspec --platforms=${{ matrix.target }})
 
@@ -102,22 +105,22 @@ jobs:
             xcode: Xcode_15.4
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: tvOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: macOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: watchOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: catalyst
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: visionOS
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index 67a89aef2ae..af24594c944 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -55,16 +55,19 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos]
-        os: [macos-14]
-        xcode: [Xcode_15.2, Xcode_16]
-    runs-on: ${{ matrix.os }}
+        build-env:
+          - os: macos-14
+            xcode: Xcode_15.2
+          - os: macos-15
+            xcode: Xcode_16.1
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Build
     #TODO: tests are not supported with Xcode 15 because the test spec depends on the iOS 8 GDCWebServer
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebasePerformance.podspec --skip-tests --platforms=${{ matrix.target }}
@@ -155,10 +158,10 @@ jobs:
             xcode: Xcode_15.4
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: iOS
           - os: macos-15
-            xcode: Xcode_16
+            xcode: Xcode_16.1
             target: tvOS
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/shared-swift.yml b/.github/workflows/shared-swift.yml
index 40f1d46fa19..6a6785b9752 100644
--- a/.github/workflows/shared-swift.yml
+++ b/.github/workflows/shared-swift.yml
@@ -24,16 +24,19 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos, macos, watchos]
-        os: [macos-14]
-        xcode: [Xcode_15.2, Xcode_16]
-    runs-on: ${{ matrix.os }}
+        build-env:
+          - os: macos-14
+            xcode: Xcode_15.2
+          - os: macos-15
+            xcode: Xcode_16.1
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Build and test
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseSharedSwift.podspec --platforms=${{ matrix.target }}
 
@@ -67,9 +70,12 @@ jobs:
     strategy:
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
-        os: [macos-14]
-        xcode: [Xcode_15.2, Xcode_16]
-    runs-on: ${{ matrix.os }}
+        build-env:
+          - os: macos-14
+            xcode: Xcode_15.2
+          - os: macos-15
+            xcode: Xcode_16.1
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: actions/cache/restore@v4
@@ -77,7 +83,7 @@ jobs:
         path: .build
         key: ${{needs.spm-package-resolved.outputs.cache_key}}
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Initialize xcodebuild
       run: scripts/setup_spm_tests.sh
     - name: Unit Tests
diff --git a/.github/workflows/storage.yml b/.github/workflows/storage.yml
index 6c4f331dbde..220f98b5741 100644
--- a/.github/workflows/storage.yml
+++ b/.github/workflows/storage.yml
@@ -195,15 +195,14 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos, macos, watchos]
-        os: [macos-14]
-        include:
+        build-env:
           - os: macos-14
             xcode: Xcode_15.3
             tests: --skip-tests
           - os: macos-15
             xcode: Xcode_16.1
             tests: --test-specs=unit
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
@@ -212,10 +211,10 @@ jobs:
     - name: Xcodes
       run: ls -l /Applications/Xcode*
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Build and test
       run: |
-       scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseStorage.podspec ${{ matrix.tests }} \
+       scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseStorage.podspec ${{ matrix.build-env.tests }} \
          --platforms=${{ matrix.target }}
 
   storage-cron-only:
@@ -224,13 +223,12 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos, macos, watchos]
-        os: [macos-14, macos-15]
-        include:
+        build-env:
           - os: macos-14
             xcode: Xcode_15.3
           - os: macos-15
             xcode: Xcode_16.1
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.build-env.os }}
     needs: pod-lib-lint
     steps:
     - uses: actions/checkout@v4
@@ -238,6 +236,6 @@ jobs:
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: PodLibLint Storage Cron
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseStorage.podspec --platforms=${{ matrix.target }} --use-static-frameworks --skip-tests
diff --git a/FirebaseAuth/CHANGELOG.md b/FirebaseAuth/CHANGELOG.md
index d5e3b31c3ba..c627b29eed5 100644
--- a/FirebaseAuth/CHANGELOG.md
+++ b/FirebaseAuth/CHANGELOG.md
@@ -1,3 +1,13 @@
+# 11.5.0
+- [fixed] Restore pre-Firebase 11 decoding behavior to prevent users getting
+  logged out when upgrading from Firebase 8.10.0 or earlier to Firebase 11.
+  Note that this fix will not be in the 11.5.0 zip and Carthage
+  distributions, but will be included from 11.6.0 onwards. (#14011)
+- [fixed] Restore Firebase 10 keychain error handling behavior when retrieving
+  Firebase Auth tokens, potentially causing user sign-out on Firebase 11. Note
+  that this fix will not be in the 11.5.0 zip and Carthage distributions, but
+  will be included from 11.6.0 onwards. (#14067)
+
 # 11.4.0
 - [fixed] Restore Firebase 10 behavior by ignoring `nil` display names used
   during multi factor enrollment. (#13856)
diff --git a/FirebaseAuth/Sources/Swift/User/User.swift b/FirebaseAuth/Sources/Swift/User/User.swift
index 94d1c13dd0a..3371520bdf8 100644
--- a/FirebaseAuth/Sources/Swift/User/User.swift
+++ b/FirebaseAuth/Sources/Swift/User/User.swift
@@ -1598,18 +1598,22 @@ extension User: NSSecureCoding {}
   /// Retrieves the Firebase authentication token, possibly refreshing it if it has expired.
   /// - Parameter forceRefresh
   func internalGetTokenAsync(forceRefresh: Bool = false) async throws -> String {
+    var keychainError = false
     do {
       let (token, tokenUpdated) = try await tokenService.fetchAccessToken(
         forcingRefresh: forceRefresh
       )
       if tokenUpdated {
         if let error = updateKeychain() {
+          keychainError = true
           throw error
         }
       }
       return token!
     } catch {
-      signOutIfTokenIsInvalid(withError: error)
+      if !keychainError {
+        signOutIfTokenIsInvalid(withError: error)
+      }
       throw error
     }
   }
@@ -1704,11 +1708,6 @@ extension User: NSSecureCoding {}
 
   public required init?(coder: NSCoder) {
     guard let userID = coder.decodeObject(of: NSString.self, forKey: kUserIDCodingKey) as? String,
-          let apiKey = coder.decodeObject(of: NSString.self, forKey: kAPIKeyCodingKey) as? String,
-          let appID = coder.decodeObject(
-            of: NSString.self,
-            forKey: kFirebaseAppIDCodingKey
-          ) as? String,
           let tokenService = coder.decodeObject(of: SecureTokenService.self,
                                                 forKey: kTokenServiceCodingKey) else {
       return nil
@@ -1746,8 +1745,17 @@ extension User: NSSecureCoding {}
     self.phoneNumber = phoneNumber
     self.metadata = metadata ?? UserMetadata(withCreationDate: nil, lastSignInDate: nil)
     self.tenantID = tenantID
-    // The `heartbeatLogger` and `appCheck` will be set later via a property update.
-    requestConfiguration = AuthRequestConfiguration(apiKey: apiKey, appID: appID)
+
+    // Note, in practice, the caller will set the `auth` property of this user
+    // instance which will as a side-effect overwrite the request configuration.
+    // The assignment here is a best-effort placeholder.
+    let apiKey = coder.decodeObject(of: NSString.self, forKey: kAPIKeyCodingKey) as? String
+    let appID = coder.decodeObject(
+      of: NSString.self,
+      forKey: kFirebaseAppIDCodingKey
+    ) as? String
+    requestConfiguration = AuthRequestConfiguration(apiKey: apiKey ?? "", appID: appID ?? "")
+
     userProfileUpdate = UserProfileUpdate()
     #if os(iOS)
       self.multiFactor = multiFactor ?? MultiFactor()
diff --git a/FirebasePerformance/CHANGELOG.md b/FirebasePerformance/CHANGELOG.md
index b0de57ecb27..fd98d461eee 100644
--- a/FirebasePerformance/CHANGELOG.md
+++ b/FirebasePerformance/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 11.5.0
+- [fixed] Replaced usage of the deprecated `UIApplication.keyWindow` property
+  with `UIWindow.isKeyWindow`; this API is also available on visionOS. Note that
+  this fix will not be in the 11.5.0 zip and Carthage distributions, but will be
+  included from 11.6.0 onwards. (#14048)
+
 # 11.4.0
 - [fixed] Fix a crash related to thread sanitization on FPRNetworkTrace class (#13581).