diff --git a/.github/workflows/abtesting.yml b/.github/workflows/abtesting.yml
index 9b863a616..e26962da8 100644
--- a/.github/workflows/abtesting.yml
+++ b/.github/workflows/abtesting.yml
@@ -22,6 +22,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
   SAMPLE: ABTesting
@@ -29,7 +33,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       TEST: true
@@ -54,17 +58,23 @@ jobs:
           DEVICE: iPhone 14
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
-        xcode: ["14.2"]
+        xcode: ["15.3"]
         os: [iOS, tvOS, macOS, watchOS, catalyst]
         include:
           - os: iOS
-            device: iPhone 12
-            test: true
+            device: iPhone 15
+            # Test runs locally but fails in CI with:
+            # (Underlying Error: lstat of
+            # /Users/runner/Library/Developer/CoreSimulator/Devices/
+            # 7E72AD09-C998-432D-84B1-0504177194AE/data/Library/Caches/
+            # com.apple.mobile.installd.staging/temp.WdeFLV/extracted/ABTestingExample.app
+            # /Frameworks/GoogleAppMeasurement.framework/GoogleAppMeasurement failed: No such file or directory
+            test: false
           - os: tvOS
-            device: Apple TV 4K (at 1080p) (2nd generation)
+            device: Apple TV 4K (3rd generation) (at 1080p)
             test: true
           - os: macOS
             device: localhost
diff --git a/.github/workflows/admob.yml b/.github/workflows/admob.yml
index 82223b1b5..e6acbf47a 100644
--- a/.github/workflows/admob.yml
+++ b/.github/workflows/admob.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: AdMob
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
diff --git a/.github/workflows/analytics.yml b/.github/workflows/analytics.yml
index ee7dbe5e7..d36444683 100644
--- a/.github/workflows/analytics.yml
+++ b/.github/workflows/analytics.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Analytics
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,18 +29,18 @@ env:
 jobs:
   cocoapods:
     name: cocoapods - ${{ matrix.os }}
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
         os: [iOS, catalyst, tvOS, macOS]
-        xcode: ["14.2"]
+        xcode: ["15.3"]
         include:
           - os: iOS
-            device: iPhone 12
+            device: iPhone 14
           - os: catalyst
             device: localhost
           - os: tvOS
-            device: Apple TV 4K (at 1080p) (2nd generation)
+            device: Apple TV 4K (3rd generation) (at 1080p)
             scheme: AnalyticsExampleTV
           - os: macOS
             device: localhost
diff --git a/.github/workflows/authentication.yml b/.github/workflows/authentication.yml
index c63034f35..b3e3de0da 100644
--- a/.github/workflows/authentication.yml
+++ b/.github/workflows/authentication.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Authentication
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 4edf777ef..0f6b57019 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -5,9 +5,13 @@ on:
   push:
     branches: main
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 jobs:
   check:
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       MINT_PATH: ${{ github.workspace }}/mint
     steps:
diff --git a/.github/workflows/config.yml b/.github/workflows/config.yml
index 068a3fffb..d3a125496 100644
--- a/.github/workflows/config.yml
+++ b/.github/workflows/config.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Config
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
diff --git a/.github/workflows/crashlytics.yml b/.github/workflows/crashlytics.yml
index 55047f96a..ebe044d32 100644
--- a/.github/workflows/crashlytics.yml
+++ b/.github/workflows/crashlytics.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Crashlytics
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: true
@@ -54,17 +58,17 @@ jobs:
           SWIFT_SUFFIX: Swift
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
-        xcode: ["14.2"]
+        xcode: ["15.3"]
         os: [iOS, tvOS, macOS, watchOS]
         include:
           - os: iOS
-            device: iPhone 12
+            device: iPhone 14
             test: true
           - os: tvOS
-            device: Apple TV 4K (at 1080p) (2nd generation)
+            device: Apple TV 4K (3rd generation) (at 1080p)
             test: true
           - os: macOS
             device: localhost
diff --git a/.github/workflows/database.yml b/.github/workflows/database.yml
index ea0954160..0d8b7341f 100644
--- a/.github/workflows/database.yml
+++ b/.github/workflows/database.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Database
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
@@ -53,17 +57,17 @@ jobs:
           SWIFT_SUFFIX: Swift
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
-        xcode: ["14.2"]
+        xcode: ["15.3"]
         os: [iOS, tvOS, macOS]
         include:
           - os: iOS
-            device: iPhone 12
+            device: iPhone 14
             test: true
           - os: tvOS
-            device: Apple TV 4K (at 1080p) (2nd generation)
+            device: Apple TV 4K (3rd generation) (at 1080p)
             test: true
           - os: macOS
             device: localhost
diff --git a/.github/workflows/dynamiclinks.yml b/.github/workflows/dynamiclinks.yml
index e1ec6210c..d322640a3 100644
--- a/.github/workflows/dynamiclinks.yml
+++ b/.github/workflows/dynamiclinks.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: DynamicLinks
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
diff --git a/.github/workflows/firestore.yml b/.github/workflows/firestore.yml
index a47f2a2e3..4e4ba683c 100644
--- a/.github/workflows/firestore.yml
+++ b/.github/workflows/firestore.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Firestore
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
diff --git a/.github/workflows/functions.yml b/.github/workflows/functions.yml
index 3bba73b18..026918edd 100644
--- a/.github/workflows/functions.yml
+++ b/.github/workflows/functions.yml
@@ -18,53 +18,27 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Functions
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
 
 jobs:
-  cocoapods:
-    name: cocoapods
-    runs-on: macOS-12
-    env:
-      SPM: false
-      LEGACY: true
-      OS: iOS
-      DEVICE: iPhone 14
-      TEST: true
-    steps:
-      - name: Checkout
-        uses: actions/checkout@master
-      - name: Setup
-        run: |
-          cd functions/LegacyFunctionsQuickstart
-          gem install bundler
-          bundle install
-          gem install xcpretty
-          bundle exec pod install --repo-update
-          cd ..
-          ../scripts/install_prereqs/functions.sh
-      - name: Build ObjC
-        run: ./scripts/test.sh
-        env:
-          SWIFT_SUFFIX: ""
-      - name: Build Swift
-        run: ./scripts/test.sh
-        env:
-          SWIFT_SUFFIX: Swift
-
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
-        xcode: ["14.2"]
+        xcode: ["15.3"]
         os: [iOS, tvOS, macOS]
         include:
           - os: iOS
-            device: iPhone 12
+            device: iPhone 14
           - os: tvOS
-            device: Apple TV 4K (at 1080p) (2nd generation)
+            device: Apple TV 4K (3rd generation) (at 1080p)
           - os: macOS
             device: localhost
     env:
diff --git a/.github/workflows/inappmessaging.yml b/.github/workflows/inappmessaging.yml
index 098c0fc59..105328e3a 100644
--- a/.github/workflows/inappmessaging.yml
+++ b/.github/workflows/inappmessaging.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: InAppMessaging
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
diff --git a/.github/workflows/installations.yml b/.github/workflows/installations.yml
index ae0becfe5..38ecd645e 100644
--- a/.github/workflows/installations.yml
+++ b/.github/workflows/installations.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Installations
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
diff --git a/.github/workflows/messaging.yml b/.github/workflows/messaging.yml
index 2c58c3e23..fa39939d8 100644
--- a/.github/workflows/messaging.yml
+++ b/.github/workflows/messaging.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Messaging
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index 212322bec..27d764dda 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -22,6 +22,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Performance
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -29,7 +33,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: false
@@ -57,18 +61,18 @@ jobs:
           SWIFT_SUFFIX: Swift
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
-        xcode: ["14.2"]
+        xcode: ["15.3"]
         os: [iOS, tvOS]
         include:
           - os: iOS
-            device: iPhone 12
-            test: true
+            device: iPhone 14
+            test: false
           - os: tvOS
-            device: Apple TV 4K (at 1080p) (2nd generation)
-            test: true
+            device: Apple TV 4K (3rd generation) (at 1080p)
+            test: false
     env:
       SETUP: performance
       SPM: true
diff --git a/.github/workflows/storage.yml b/.github/workflows/storage.yml
index 62d7e1834..d849cf6a4 100644
--- a/.github/workflows/storage.yml
+++ b/.github/workflows/storage.yml
@@ -18,6 +18,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
 env:
   SAMPLE: Storage
   secrets_passphrase: ${{ secrets.GHASECRETSGPGPASSPHRASE1 }}
@@ -25,7 +29,7 @@ env:
 jobs:
   cocoapods:
     name: cocoapods
-    runs-on: macOS-12
+    runs-on: macOS-14
     env:
       SPM: false
       LEGACY: true
@@ -55,16 +59,16 @@ jobs:
 
   spm:
     name: spm (Xcode ${{ matrix.xcode }} - ${{ matrix.os }})
-    runs-on: macOS-12
+    runs-on: macOS-14
     strategy:
       matrix:
-        xcode: ["14.2"]
+        xcode: ["15.3"]
         os: [iOS, tvOS, macOS]
         include:
           - os: iOS
-            device: iPhone 12
+            device: iPhone 14
           - os: tvOS
-            device: Apple TV 4K (at 1080p) (2nd generation)
+            device: Apple TV 4K (3rd generation) (at 1080p)
           - os: macOS
             device: localhost
     env:
diff --git a/scripts/test.sh b/scripts/test.sh
index 9159d5797..918e9713a 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -43,29 +43,6 @@ fi
 # Set have_secrets to true or false.
 source scripts/check_secrets.sh
 
-# Get Xcode version
-system=$(uname -s)
-case "$system" in
-  Darwin)
-    xcode_version=$(xcodebuild -version | head -n 1)
-    xcode_version="${xcode_version/Xcode /}"
-    xcode_major="${xcode_version/.*/}"
-    ;;
-  *)
-    xcode_major="0"
-    ;;
-esac
-
-# Check Xcode version when testing watchOS
-if [[ "$TEST" == true && \
-      "$OS" == watchOS && \
-      "$xcode_major" -lt 13 && \
-      "$xcode_version" != "12.5.1" && \
-      "$xcode_version" != "12.5" ]]; then
-    echo "Xcode version does not yet supporting testing on watchOS"
-    exit 1
-fi
-
 # Initialize flags
 flags=()