diff --git a/.github/actions/setup_simulator/action.yml b/.github/actions/setup_simulator/action.yml
new file mode 100644
index 000000000..1bb56b9a6
--- /dev/null
+++ b/.github/actions/setup_simulator/action.yml
@@ -0,0 +1,37 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# TODO: Temporary local copy of firebase/firebase-ios-sdk's setup_simulator
+# composite action. Consolidate to reference
+# `firebase/firebase-ios-sdk/.github/actions/setup_simulator` once upstream
+# resolves its script path via `$GITHUB_ACTION_PATH` instead of
+# `github.workspace` and supports `macOS|catalyst` as a no-op.
+
+name: 'Setup Simulator'
+description: 'Creates a standardized simulator matching the active Xcode runtime.'
+inputs:
+  platform:
+    description: 'The platform to create a simulator for (iOS, tvOS, watchOS, visionOS, all). Default is all.'
+    required: false
+    default: 'all'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Run Simulator Setup Script
+      shell: bash
+      env:
+        PLATFORM: ${{ inputs.platform }}
+      run: |
+        "$GITHUB_WORKSPACE/scripts/setup_simulator.sh" "$PLATFORM"
diff --git a/.github/workflows/abtesting.yml b/.github/workflows/abtesting.yml
index b0f447d5c..4b01f6870 100644
--- a/.github/workflows/abtesting.yml
+++ b/.github/workflows/abtesting.yml
@@ -36,14 +36,18 @@ env:
 jobs:
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-15
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
-        xcode: ["26.2"]
+        xcode: ["26.2", "26.4"]
         os: [iOS, tvOS, macOS, watchOS, catalyst]
         include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
           - os: iOS
-            device: iPhone 16
             # Test runs locally but fails in CI with:
             # (Underlying Error: lstat of
             # /Users/runner/Library/Developer/CoreSimulator/Devices/
@@ -52,29 +56,28 @@ jobs:
             # /Frameworks/GoogleAppMeasurement.framework/GoogleAppMeasurement failed: No such file or directory
             test: false
           - os: tvOS
-            device: Apple TV 4K (3rd generation) (at 1080p)
             test: true
           - os: macOS
-            device: localhost
             test: true
           - os: watchOS
-            device: Apple Watch Series 5 - 44m
             test: false
           - os: catalyst
-            device: localhost
             test: false # disabled due to a permissions error on launch (OSStatus -54).
     env:
       SETUP: abtesting
       SPM: true
       DIR: abtesting
       OS: ${{ matrix.os }}
-      DEVICE: ${{ matrix.device }}
       TEST: ${{ matrix.test }}
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: ${{ matrix.os }}
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/analytics.yml b/.github/workflows/analytics.yml
index 167668b10..cf1eeb00d 100644
--- a/.github/workflows/analytics.yml
+++ b/.github/workflows/analytics.yml
@@ -32,34 +32,34 @@ env:
 jobs:
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-15
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
         # TODO: Re-enable when ODM2 catalyst support is investigated
-        # os: [iOS, catalyst, tvOS, macOS]        
+        # os: [iOS, catalyst, tvOS, macOS]
         os: [iOS, tvOS, macOS]
-        xcode: ["26.2"]
+        xcode: ["26.2", "26.4"]
         include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
           - os: iOS
-            device: iPhone 16
             test: true
           # TODO: Re-enable when ODM2 catalyst support is investigated
           # - os: catalyst
-          #   device: localhost
           #   test: false # disabled due to a permissions error on launch (OSStatus -54).
           - os: tvOS
-            device: Apple TV 4K (3rd generation) (at 1080p)
             scheme: AnalyticsExampleTV
             test: true
           - os: macOS
-            device: localhost
             scheme: AnalyticsExampleMac
             test: true
 
     env:
       SPM: true
       OS: ${{ matrix.os }}
-      DEVICE: ${{ matrix.device }}
       SCHEME: ${{ matrix.scheme || 'AnalyticsExample' }}
       DIR: analytics
     steps:
@@ -67,6 +67,10 @@ jobs:
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: ${{ matrix.os }}
       - name: Setup
         run: |
           cd analytics
diff --git a/.github/workflows/authentication.yml b/.github/workflows/authentication.yml
index 134ebd409..84e2a79ab 100644
--- a/.github/workflows/authentication.yml
+++ b/.github/workflows/authentication.yml
@@ -31,20 +31,33 @@ env:
 
 jobs:
   spm:
-    runs-on: macOS-15
+    name: spm (Xcode ${{ matrix.xcode }} - iOS)
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       OS: iOS
       SETUP: authentication
       SPM: true
       DIR: authentication
-      DEVICE: iPhone 16
       TEST: false
       SCHEME: AuthenticationExample
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/config.yml b/.github/workflows/config.yml
index 8e514bdbd..cdb3028b5 100644
--- a/.github/workflows/config.yml
+++ b/.github/workflows/config.yml
@@ -31,10 +31,19 @@ env:
 
 jobs:
   spm:
-    runs-on: macOS-15
+    name: spm (Xcode ${{ matrix.xcode }} - iOS)
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       OS: iOS
-      DEVICE: iPhone 16
       DIR: config
       SPM: true
       SCHEME: ConfigExample
@@ -43,11 +52,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           cd config
           ../scripts/install_prereqs/config.sh
-          xcrun simctl boot "iPhone 16"
+          xcrun simctl boot "Firebase-iPhone-15-Pro"
       - name: Build Swift
         run: ./scripts/test.sh
diff --git a/.github/workflows/crashlytics.yml b/.github/workflows/crashlytics.yml
index 8fca3a785..5fa9902d4 100644
--- a/.github/workflows/crashlytics.yml
+++ b/.github/workflows/crashlytics.yml
@@ -32,36 +32,40 @@ env:
 jobs:
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-15
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
-        xcode: ["26.2"]
+        xcode: ["26.2", "26.4"]
         os: [iOS, tvOS, macOS, watchOS]
         include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
           - os: iOS
-            device: iPhone 16
             test: false # flaky
           - os: tvOS
-            device: Apple TV 4K (3rd generation) (at 1080p)
             test: true
           - os: macOS
-            device: localhost
             test: true
           - os: watchOS
-            device: Apple Watch Series 5 - 44m
             test: false
     env:
       SETUP: crashlytics
       SPM: true
       DIR: crashlytics
       OS: ${{ matrix.os }}
-      DEVICE: ${{ matrix.device }}
       TEST: ${{ matrix.test }}
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: ${{ matrix.os }}
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/database.yml b/.github/workflows/database.yml
index 0a9502d0e..95eb00272 100644
--- a/.github/workflows/database.yml
+++ b/.github/workflows/database.yml
@@ -31,20 +31,32 @@ env:
 
 jobs:
   spm-buildonly:
-    name: spm (non-SwiftUI)
-    runs-on: macOS-15
+    name: spm (Xcode ${{ matrix.xcode }} - non-SwiftUI)
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       OS: iOS
       SPM: true
       DIR: database
-      DEVICE: iPhone 16
       TEST: false
       SCHEME: DatabaseExample
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           gem install xcpretty
@@ -55,33 +67,38 @@ jobs:
 
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-15
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
-        xcode: ["26.2"]
+        xcode: ["26.2", "26.4"]
         os: [iOS, tvOS, macOS]
         include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
           - os: iOS
-            device: iPhone 16
             test: false
           - os: tvOS
-            device: Apple TV 4K (3rd generation) (at 1080p)
             test: true
           - os: macOS
-            device: localhost
             test: false # flaky macOS UITest: UITests.testStaticSignUpView() sometimes fails
     env:
       SETUP: database
       SPM: true
       DIR: database/DatabaseExampleSwiftUI/DatabaseExample
       OS: ${{ matrix.os }}
-      DEVICE: ${{ matrix.device }}
       TEST: ${{ matrix.test }}
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: ${{ matrix.os }}
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/firebaseai.yml b/.github/workflows/firebaseai.yml
index b5cb9e06a..0118dc46e 100644
--- a/.github/workflows/firebaseai.yml
+++ b/.github/workflows/firebaseai.yml
@@ -22,45 +22,36 @@ env:
 
 jobs:
   spm:
-    name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.platform }})
+    name: spm (Xcode ${{ matrix.xcode }} - iOS)
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
+        xcode: ["26.2", "26.4"]
         include:
-          - os: macos-26
-            xcode: "26.6"
-            platform: iOS
-            device: iPhone 17 Pro
-            ios_version: "26.5"
-          - os: macos-15
-            xcode: "26.2"
-            platform: iOS
-            device: iPhone 16
-            ios_version: "18.5"
-    runs-on: ${{ matrix.os }}
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SETUP: firebaseai
       SPM: true
       DIR: firebaseai
-      OS: ${{ matrix.platform }}
-      VERSION: ${{ matrix.ios_version }}
-      DEVICE: ${{ matrix.device }}
+      OS: iOS
       TEST: false
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
-      - name: Install simulators in case they are missing.
-        uses: nick-fields/retry@ce71cc2ab81d554ebbe88c79ab5975992d79ba08 # v3
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
         with:
-          timeout_minutes: 15
-          max_attempts: 5
-          retry_wait_seconds: 120
-          command: sudo xcodebuild -downloadPlatform iOS
+          platform: iOS
       - name: Setup
         run: |
           gem install xcpretty
       - name: Placeholder GoogleService-Info.plist good enough for build only testing.
         run: cp ./mock-GoogleService-Info.plist ./firebaseai/GoogleService-Info.plist
-      - name: Build and Test SwiftUI (${{ matrix.platform }})
+      - name: Build and Test SwiftUI (iOS)
         run: ./scripts/test.sh
diff --git a/.github/workflows/firestore.yml b/.github/workflows/firestore.yml
index e7039575b..13ed7aff3 100644
--- a/.github/workflows/firestore.yml
+++ b/.github/workflows/firestore.yml
@@ -31,19 +31,35 @@ env:
 
 jobs:
   spm:
-    runs-on: macos-26
+    name: spm (Xcode ${{ matrix.xcode }} - iOS)
+    runs-on: ${{ matrix.runner }}
+    # TODO: Remove continue-on-error once firebase-ios-sdk 13.2.0 is released
+    # with the Xcode 26.2 package traits workaround (firebase/firebase-ios-sdk#16944).
+    continue-on-error: ${{ matrix.xcode == '26.2' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SPM: true
       OS: iOS
       DIR: firestore
-      DEVICE: iPhone 17 Pro
       TEST: false
       SCHEME: FirestoreExample
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.4.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           cd firestore
diff --git a/.github/workflows/functions.yml b/.github/workflows/functions.yml
index ad70b47b5..5c894d3c1 100644
--- a/.github/workflows/functions.yml
+++ b/.github/workflows/functions.yml
@@ -32,30 +32,32 @@ env:
 jobs:
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-15
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
-        xcode: ["26.2"]
+        xcode: ["26.2", "26.4"]
         os: [iOS, tvOS, macOS]
         include:
-          - os: iOS
-            device: iPhone 16
-          - os: tvOS
-            device: Apple TV 4K (3rd generation) (at 1080p)
-          - os: macOS
-            device: localhost
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SETUP: functions
       SPM: true
       DIR: functions/FunctionsExample
       OS: ${{ matrix.os }}
-      DEVICE: ${{ matrix.device }}
       TEST: false
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: ${{ matrix.os }}
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/inappmessaging.yml b/.github/workflows/inappmessaging.yml
index 422ce2904..214414132 100644
--- a/.github/workflows/inappmessaging.yml
+++ b/.github/workflows/inappmessaging.yml
@@ -31,18 +31,31 @@ env:
 
 jobs:
   spm:
-    runs-on: macOS-15
+    name: spm (Xcode ${{ matrix.xcode }} - iOS)
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SPM: true
       DIR: inappmessaging
       OS: iOS
-      DEVICE: iPhone 16
       TEST: false
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           cd inappmessaging
diff --git a/.github/workflows/installations.yml b/.github/workflows/installations.yml
index 1e18d74ba..6c713e9d4 100644
--- a/.github/workflows/installations.yml
+++ b/.github/workflows/installations.yml
@@ -31,18 +31,31 @@ env:
 
 jobs:
   spm:
-    runs-on: macOS-15
+    name: spm (Xcode ${{ matrix.xcode }} - iOS)
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SPM: true
       OS: iOS
-      DEVICE: iPhone 16
       TEST: true
       DIR: installations
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           cd installations
diff --git a/.github/workflows/messaging.yml b/.github/workflows/messaging.yml
index 68e29f7b9..3cea449eb 100644
--- a/.github/workflows/messaging.yml
+++ b/.github/workflows/messaging.yml
@@ -31,18 +31,31 @@ env:
 
 jobs:
   spm:
-    runs-on: macOS-15
+    name: spm (Xcode ${{ matrix.xcode }} - iOS)
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SPM: true
       OS: iOS
-      DEVICE: iPhone 16
       TEST: false
       DIR: messaging
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           cd messaging
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index c67b2a58b..c83de0392 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -31,12 +31,20 @@ env:
 
 jobs:
   spm-buildonly:
-    name: spm
-    runs-on: macOS-15
+    name: spm (Xcode ${{ matrix.xcode }})
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ["26.2", "26.4"]
+        include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SPM: true
       OS: iOS
-      DEVICE: iPhone 16
       TEST: false
       DIR: performance
       SCHEME: PerformanceExample (iOS)
@@ -44,7 +52,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: iOS
       - name: Setup
         run: |
           cd performance
@@ -52,21 +64,24 @@ jobs:
           ../scripts/install_prereqs/performance.sh
       - name: Build Swift
         run: ./scripts/test.sh
-          
+
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-15
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
-        xcode: ["26.2"]
+        xcode: ["26.2", "26.4"]
         os: [iOS, tvOS]
         include:
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
           - os: iOS
-            device: iPhone 16
             test: false
             scheme: PerformanceExample (iOS)
           - os: tvOS
-            device: Apple TV 4K (3rd generation) (at 1080p)
             test: false
             scheme: PerformanceExample (tvOS)
     env:
@@ -74,7 +89,6 @@ jobs:
       SPM: true
       DIR: performance
       OS: ${{ matrix.os }}
-      DEVICE: ${{ matrix.device }}
       TEST: ${{ matrix.test }}
       SCHEME: ${{ matrix.scheme }}
     steps:
@@ -82,6 +96,10 @@ jobs:
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: ${{ matrix.os }}
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/storage.yml b/.github/workflows/storage.yml
index ec200b06b..13a46964a 100644
--- a/.github/workflows/storage.yml
+++ b/.github/workflows/storage.yml
@@ -32,30 +32,32 @@ env:
 jobs:
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-15
+    runs-on: ${{ matrix.runner }}
     strategy:
+      fail-fast: false
       matrix:
-        xcode: ["26.2"]
+        xcode: ["26.2", "26.4"]
         os: [iOS, tvOS, macOS]
         include:
-          - os: iOS
-            device: iPhone 16
-          - os: tvOS
-            device: Apple TV 4K (3rd generation) (at 1080p)
-          - os: macOS
-            device: localhost
+          - xcode: "26.2"
+            runner: macos-15
+          - xcode: "26.4"
+            runner: macos-26
     env:
       SETUP: storage
       SPM: true
       DIR: storage
       OS: ${{ matrix.os }}
-      DEVICE: ${{ matrix.device }}
       TEST: false
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+      - name: Setup simulator
+        uses: ./.github/actions/setup_simulator
+        with:
+          platform: ${{ matrix.os }}
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/scripts/setup_simulator.sh b/scripts/setup_simulator.sh
new file mode 100755
index 000000000..fa049766b
--- /dev/null
+++ b/scripts/setup_simulator.sh
@@ -0,0 +1,143 @@
+#!/usr/bin/env bash
+
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# TODO: Temporary local copy of firebase/firebase-ios-sdk/scripts/setup_simulator.sh
+# (with SDK-major runtime matching and `macOS|catalyst` no-op support).
+# Consolidate once upstream `firebase-ios-sdk` supports cross-repo composite
+# action invocation.
+
+set -euo pipefail
+
+PLATFORM="${1:-all}"
+
+echo " Active Xcode Info:"
+xcodebuild -version
+echo " Installed Simulator Runtimes:"
+xcrun simctl list runtimes
+
+get_runtime() {
+  local platform_prefix="$1"
+  local sdk_name=""
+  case "$platform_prefix" in
+    iOS) sdk_name="iphonesimulator" ;;
+    tvOS) sdk_name="appletvsimulator" ;;
+    watchOS) sdk_name="watchsimulator" ;;
+    visionOS) sdk_name="xrsimulator" ;;
+  esac
+
+  local target_major=""
+  if [[ -n "$sdk_name" ]]; then
+    local sdk_ver
+    sdk_ver=$(xcrun --sdk "$sdk_name" --show-sdk-version 2>/dev/null || true)
+    if [[ -n "$sdk_ver" ]]; then
+      target_major="${sdk_ver%%.*}"
+    fi
+  fi
+
+  local runtime=""
+  if [[ -n "$target_major" ]]; then
+    runtime=$(xcrun simctl list runtimes available | grep "^${platform_prefix} ${target_major}\." | grep -o "com\.apple\.CoreSimulator\.SimRuntime\.${platform_prefix}-[0-9-]*" | tail -n 1 || true)
+  fi
+
+  if [[ -z "$runtime" ]]; then
+    runtime=$(xcrun simctl list runtimes available | grep "^${platform_prefix}" | grep -o "com\.apple\.CoreSimulator\.SimRuntime\.${platform_prefix}-[0-9-]*" | tail -n 1 || true)
+  fi
+
+  echo "$runtime"
+}
+
+create_sim() {
+  local sim_name="$1"
+  local runtime="$2"
+  shift 2
+  local device_types=("$@")
+
+  if [[ -z "$runtime" ]]; then
+    echo "⚠️ Warning: No available runtime found for $sim_name. Skipping creation."
+    return 0
+  fi
+
+  if xcrun simctl list devices available | grep -q "${sim_name} ("; then
+    echo "✅ Simulator '$sim_name' already exists and is available."
+  else
+    local created=false
+    for device_type in "${device_types[@]}"; do
+      echo "📲 Attempting to create '$sim_name' with type '$device_type' and runtime '$runtime'..."
+      if xcrun simctl create "$sim_name" "$device_type" "$runtime" 2>/dev/null; then
+        echo "✅ Successfully created '$sim_name' using '$device_type'."
+        created=true
+        break
+      else
+        echo "⚠️ Device type '$device_type' is incompatible with '$runtime' or unavailable."
+      fi
+    done
+
+    if [[ "$created" = false ]]; then
+      echo "❌ Failed to create simulator '$sim_name' with any provided device types."
+      return 1
+    fi
+  fi
+}
+
+case "$PLATFORM" in
+  iOS)
+    create_sim "Firebase-iPhone-15-Pro" "$(get_runtime iOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-15-Pro" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-16-Pro" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-17-Pro" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-Duo"
+    ;;
+  tvOS)
+    create_sim "Firebase-Apple-TV-4K-Gen-2" "$(get_runtime tvOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-2nd-generation-1080p" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-3rd-generation-1080p"
+    ;;
+  watchOS)
+    create_sim "Firebase-Apple-Watch-Ultra-2" "$(get_runtime watchOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Ultra-2-49mm" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Ultra-3-49mm" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Ultra-4-49mm" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-SE-3-44mm"
+    ;;
+  visionOS)
+    create_sim "Firebase-Apple-Vision-Pro" "$(get_runtime visionOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Vision-Pro"
+    ;;
+  macOS|catalyst)
+    echo "ℹ️ Platform '$PLATFORM' does not require a simulator."
+    ;;
+  all)
+    create_sim "Firebase-iPhone-15-Pro" "$(get_runtime iOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-15-Pro" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-16-Pro" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-17-Pro" \
+      "com.apple.CoreSimulator.SimDeviceType.iPhone-Duo"
+    create_sim "Firebase-Apple-TV-4K-Gen-2" "$(get_runtime tvOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-2nd-generation-1080p" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-3rd-generation-1080p"
+    create_sim "Firebase-Apple-Watch-Ultra-2" "$(get_runtime watchOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Ultra-2-49mm" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Ultra-3-49mm" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Ultra-4-49mm" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Watch-SE-3-44mm"
+    create_sim "Firebase-Apple-Vision-Pro" "$(get_runtime visionOS)" \
+      "com.apple.CoreSimulator.SimDeviceType.Apple-Vision-Pro"
+    ;;
+  *)
+    echo "❌ Unknown platform: $PLATFORM"
+    exit 1
+    ;;
+esac
diff --git a/scripts/test.sh b/scripts/test.sh
index 9da46ae9e..d37832248 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -38,15 +38,26 @@ if [[ -z "${OS:-}" ]]; then
     OS=iOS
     echo "Defaulting to OS=$OS"
 fi
-if [[ -z "${DEVICE:-}" && "$OS" == "iOS" ]]; then
-    DEVICE="iPhone 17 Pro"
-    echo "Defaulting to DEVICE=$DEVICE"
+if [[ -z "${DEVICE:-}" ]]; then
+    case "$OS" in
+        iOS) DEVICE="Firebase-iPhone-15-Pro" ;;
+        tvOS) DEVICE="Firebase-Apple-TV-4K-Gen-2" ;;
+        watchOS) DEVICE="Firebase-Apple-Watch-Ultra-2" ;;
+        macOS|catalyst) DEVICE="localhost" ;;
+    esac
+    echo "Defaulting to DEVICE=${DEVICE:-}"
 fi
 if [[ -z "${TEST:-}" ]]; then
     TEST=true
     echo "Defaulting to TEST=$TEST"
 fi
 
+if [[ "$OS" == "iOS" || "$OS" == "tvOS" || "$OS" == "watchOS" ]]; then
+    if ! xcrun simctl list devices available | grep -q "${DEVICE} ("; then
+        ./scripts/setup_simulator.sh "$OS"
+    fi
+fi
+
 # Set have_secrets to true or false.
 have_secrets=false
 # shellcheck disable=SC1091