diff --git a/.github/workflows/abtesting.yml b/.github/workflows/abtesting.yml
index dbd92e12b..b0f447d5c 100644
--- a/.github/workflows/abtesting.yml
+++ b/.github/workflows/abtesting.yml
@@ -39,7 +39,7 @@ jobs:
     runs-on: macOS-15
     strategy:
       matrix:
-        xcode: ["16.4"]
+        xcode: ["26.2"]
         os: [iOS, tvOS, macOS, watchOS, catalyst]
         include:
           - os: iOS
@@ -72,7 +72,9 @@ jobs:
       TEST: ${{ matrix.test }}
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/analytics.yml b/.github/workflows/analytics.yml
index 13cd58278..167668b10 100644
--- a/.github/workflows/analytics.yml
+++ b/.github/workflows/analytics.yml
@@ -38,7 +38,7 @@ jobs:
         # TODO: Re-enable when ODM2 catalyst support is investigated
         # os: [iOS, catalyst, tvOS, macOS]        
         os: [iOS, tvOS, macOS]
-        xcode: ["16.4"]
+        xcode: ["26.2"]
         include:
           - os: iOS
             device: iPhone 16
@@ -64,7 +64,7 @@ jobs:
       DIR: analytics
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup
diff --git a/.github/workflows/authentication.yml b/.github/workflows/authentication.yml
index 884ff76d0..134ebd409 100644
--- a/.github/workflows/authentication.yml
+++ b/.github/workflows/authentication.yml
@@ -42,9 +42,9 @@ jobs:
       SCHEME: AuthenticationExample
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Xcode
-        run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index a26cbfcd2..a2e5f69ee 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
     - name: Cache Mint packages
-      uses: actions/cache@v4
+      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
       with:
         path: ${{ env.MINT_PATH }}
         key: ${{ runner.os }}-mint-${{ hashFiles('**/Mintfile') }}
diff --git a/.github/workflows/config.yml b/.github/workflows/config.yml
index 74e769fa8..8e514bdbd 100644
--- a/.github/workflows/config.yml
+++ b/.github/workflows/config.yml
@@ -41,7 +41,9 @@ jobs:
       TEST: true
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           cd config
diff --git a/.github/workflows/crashlytics.yml b/.github/workflows/crashlytics.yml
index 905d27fcf..8fca3a785 100644
--- a/.github/workflows/crashlytics.yml
+++ b/.github/workflows/crashlytics.yml
@@ -35,7 +35,7 @@ jobs:
     runs-on: macOS-15
     strategy:
       matrix:
-        xcode: ["16.4"]
+        xcode: ["26.2"]
         os: [iOS, tvOS, macOS, watchOS]
         include:
           - os: iOS
@@ -59,7 +59,9 @@ jobs:
       TEST: ${{ matrix.test }}
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/database.yml b/.github/workflows/database.yml
index 2bffc89b8..0a9502d0e 100644
--- a/.github/workflows/database.yml
+++ b/.github/workflows/database.yml
@@ -42,7 +42,9 @@ jobs:
       SCHEME: DatabaseExample
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
@@ -56,7 +58,7 @@ jobs:
     runs-on: macOS-15
     strategy:
       matrix:
-        xcode: ["16.4"]
+        xcode: ["26.2"]
         os: [iOS, tvOS, macOS]
         include:
           - os: iOS
@@ -77,7 +79,9 @@ jobs:
       TEST: ${{ matrix.test }}
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/firestore.yml b/.github/workflows/firestore.yml
index 3fe2865c6..bfcfb3a3c 100644
--- a/.github/workflows/firestore.yml
+++ b/.github/workflows/firestore.yml
@@ -41,7 +41,9 @@ jobs:
       SCHEME: FirestoreExample
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           cd firestore
diff --git a/.github/workflows/functions.yml b/.github/workflows/functions.yml
index e8b3a626e..ad70b47b5 100644
--- a/.github/workflows/functions.yml
+++ b/.github/workflows/functions.yml
@@ -35,7 +35,7 @@ jobs:
     runs-on: macOS-15
     strategy:
       matrix:
-        xcode: ["16.4"]
+        xcode: ["26.2"]
         os: [iOS, tvOS, macOS]
         include:
           - os: iOS
@@ -53,7 +53,9 @@ jobs:
       TEST: false
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/inappmessaging.yml b/.github/workflows/inappmessaging.yml
index 0844d4c71..422ce2904 100644
--- a/.github/workflows/inappmessaging.yml
+++ b/.github/workflows/inappmessaging.yml
@@ -40,7 +40,9 @@ jobs:
       TEST: false
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           cd inappmessaging
diff --git a/.github/workflows/installations.yml b/.github/workflows/installations.yml
index 4ba87fcca..1e18d74ba 100644
--- a/.github/workflows/installations.yml
+++ b/.github/workflows/installations.yml
@@ -40,7 +40,9 @@ jobs:
       DIR: installations
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           cd installations
diff --git a/.github/workflows/messaging.yml b/.github/workflows/messaging.yml
index ac8ea65cc..68e29f7b9 100644
--- a/.github/workflows/messaging.yml
+++ b/.github/workflows/messaging.yml
@@ -40,7 +40,9 @@ jobs:
       DIR: messaging
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           cd messaging
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index 74475607e..c67b2a58b 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -42,7 +42,9 @@ jobs:
       SCHEME: PerformanceExample (iOS)
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
       - name: Setup
         run: |
           cd performance
@@ -56,7 +58,7 @@ jobs:
     runs-on: macOS-15
     strategy:
       matrix:
-        xcode: ["16.4"]
+        xcode: ["26.2"]
         os: [iOS, tvOS]
         include:
           - os: iOS
@@ -77,7 +79,9 @@ jobs:
       SCHEME: ${{ matrix.scheme }}
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/.github/workflows/storage.yml b/.github/workflows/storage.yml
index a15217d78..ec200b06b 100644
--- a/.github/workflows/storage.yml
+++ b/.github/workflows/storage.yml
@@ -35,7 +35,7 @@ jobs:
     runs-on: macOS-15
     strategy:
       matrix:
-        xcode: ["16.4"]
+        xcode: ["26.2"]
         os: [iOS, tvOS, macOS]
         include:
           - os: iOS
@@ -53,7 +53,9 @@ jobs:
       TEST: false
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup
         run: |
           gem install xcpretty
diff --git a/firebaseai/FirebaseAIExample/Shared/Audio/AudioController.swift b/firebaseai/FirebaseAIExample/Shared/Audio/AudioController.swift
index 0fc1647fa..f9f69be39 100644
--- a/firebaseai/FirebaseAIExample/Shared/Audio/AudioController.swift
+++ b/firebaseai/FirebaseAIExample/Shared/Audio/AudioController.swift
@@ -15,12 +15,6 @@
 import AVFoundation
 import OSLog
 
-#if compiler(<6.2)
-  extension AVAudioSession.CategoryOptions {
-    static let allowBluetoothHFP = AVAudioSession.CategoryOptions.allowBluetooth
-  }
-#endif
-
 /// Controls audio playback and recording.
 actor AudioController {
   private var logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "generative-ai")
diff --git a/scripts/build-for-testing.sh b/scripts/build-for-testing.sh
index bd8121743..c1d23bcea 100755
--- a/scripts/build-for-testing.sh
+++ b/scripts/build-for-testing.sh
@@ -26,11 +26,7 @@ xcode_version=$(xcodebuild -version | grep Xcode)
 xcode_version="${xcode_version/Xcode /}"
 xcode_major="${xcode_version/.*/}"
 
-if [[ "$xcode_major" -ge 26 ]]; then
-  iphone_version="17"
-elif [[ "$xcode_major" -ge 16 ]]; then
-  iphone_version="16"
-else
+if [[ "$xcode_major" -lt 26 ]]; then
   echo "Unsupported Xcode version $xcode_version; exiting." 1>&2
   exit 1
 fi
@@ -42,9 +38,7 @@ if [[ -z "${SPM:-}" ]]; then
 fi
 if [[ -z "${OS:-}" ]]; then
     OS=iOS
-    DEVICE="iPhone ${iphone_version}"
     echo "Defaulting to OS=$OS"
-    echo "Defaulting to DEVICE=$DEVICE"
 fi
 
 # Set have_secrets to true or false.
diff --git a/scripts/test.sh b/scripts/test.sh
index 734658635..620510bf6 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -24,13 +24,7 @@ xcode_version=$(xcodebuild -version | grep Xcode)
 xcode_version="${xcode_version/Xcode /}"
 xcode_major="${xcode_version/.*/}"
 
-if [[ "$xcode_major" -ge 26 ]]; then
-  iphone_version="17 Pro"
-  ios_version="26.1"
-elif [[ "$xcode_major" -ge 16 ]]; then
-  iphone_version="16 Pro"
-  ios_version="18.6"
-else
+if [[ "$xcode_major" -lt 26 ]]; then
   echo "Unsupported Xcode version $xcode_version; exiting." 1>&2
   exit 1
 fi
@@ -42,8 +36,10 @@ if [[ -z "${SPM:-}" ]]; then
 fi
 if [[ -z "${OS:-}" ]]; then
     OS=iOS
-    DEVICE="iPhone ${iphone_version}"
     echo "Defaulting to OS=$OS"
+fi
+if [[ -z "${DEVICE:-}" && "$OS" == "iOS" ]]; then
+    DEVICE="iPhone 17 Pro"
     echo "Defaulting to DEVICE=$DEVICE"
 fi
 if [[ -z "${TEST:-}" ]]; then
@@ -153,8 +149,6 @@ function xcb() {
 }
 
 # Run xcodebuild
-if [[ "${GITHUB_ACTIONS:-}" == "true" ]]; then
-  sudo xcode-select -s "/Applications/Xcode_${xcode_version}.app/Contents/Developer"
-fi
+xcode-select -p
 xcb "${flags[@]}"
 echo "$message"