diff --git a/.github/actions/setup_simulator/action.yml b/.github/actions/setup_simulator/action.yml
deleted file mode 100644
index 3eecbe12c..000000000
--- a/.github/actions/setup_simulator/action.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-# 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: ${{ inputs.platform }}
-      run: |
-        bash "$GITHUB_WORKSPACE/scripts/setup_simulator.sh" "$PLATFORM"
diff --git a/.github/workflows/abtesting.yml b/.github/workflows/abtesting.yml
index 3f9489211..04e94e415 100644
--- a/.github/workflows/abtesting.yml
+++ b/.github/workflows/abtesting.yml
@@ -77,7 +77,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: ${{ matrix.os }}
       - name: Setup
diff --git a/.github/workflows/analytics.yml b/.github/workflows/analytics.yml
index ef91efdcf..e5895adf6 100644
--- a/.github/workflows/analytics.yml
+++ b/.github/workflows/analytics.yml
@@ -70,7 +70,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: ${{ matrix.os }}
       - name: Setup
diff --git a/.github/workflows/authentication.yml b/.github/workflows/authentication.yml
index f09e1391e..8fb5b87e4 100644
--- a/.github/workflows/authentication.yml
+++ b/.github/workflows/authentication.yml
@@ -57,7 +57,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
diff --git a/.github/workflows/config.yml b/.github/workflows/config.yml
index 96f8c9a22..f10dcd570 100644
--- a/.github/workflows/config.yml
+++ b/.github/workflows/config.yml
@@ -56,7 +56,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
diff --git a/.github/workflows/crashlytics.yml b/.github/workflows/crashlytics.yml
index 28f89a8ac..f26de7f42 100644
--- a/.github/workflows/crashlytics.yml
+++ b/.github/workflows/crashlytics.yml
@@ -65,7 +65,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: ${{ matrix.os }}
       - name: Setup
diff --git a/.github/workflows/database.yml b/.github/workflows/database.yml
index 0424bc338..6fb47954a 100644
--- a/.github/workflows/database.yml
+++ b/.github/workflows/database.yml
@@ -56,7 +56,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
@@ -100,7 +100,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: ${{ matrix.os }}
       - name: Setup
diff --git a/.github/workflows/firebaseai.yml b/.github/workflows/firebaseai.yml
index 1f6ae5e55..45b3e272d 100644
--- a/.github/workflows/firebaseai.yml
+++ b/.github/workflows/firebaseai.yml
@@ -47,7 +47,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
diff --git a/.github/workflows/firestore.yml b/.github/workflows/firestore.yml
index d23ba98ed..a89451041 100644
--- a/.github/workflows/firestore.yml
+++ b/.github/workflows/firestore.yml
@@ -59,7 +59,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
diff --git a/.github/workflows/functions.yml b/.github/workflows/functions.yml
index d3f170c29..6f481a3f4 100644
--- a/.github/workflows/functions.yml
+++ b/.github/workflows/functions.yml
@@ -57,7 +57,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: ${{ matrix.os }}
       - name: Setup
diff --git a/.github/workflows/inappmessaging.yml b/.github/workflows/inappmessaging.yml
index 3584da1d8..ed64c42e0 100644
--- a/.github/workflows/inappmessaging.yml
+++ b/.github/workflows/inappmessaging.yml
@@ -55,7 +55,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
diff --git a/.github/workflows/installations.yml b/.github/workflows/installations.yml
index 783ea5340..e52ccaee4 100644
--- a/.github/workflows/installations.yml
+++ b/.github/workflows/installations.yml
@@ -55,7 +55,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
diff --git a/.github/workflows/messaging.yml b/.github/workflows/messaging.yml
index 738190d03..41fd3f00a 100644
--- a/.github/workflows/messaging.yml
+++ b/.github/workflows/messaging.yml
@@ -55,7 +55,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index 5402f8f95..d97c0b371 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -56,7 +56,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: iOS
       - name: Setup
@@ -101,7 +101,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: ${{ matrix.os }}
       - name: Setup
diff --git a/.github/workflows/storage.yml b/.github/workflows/storage.yml
index 9d169351d..3c2558505 100644
--- a/.github/workflows/storage.yml
+++ b/.github/workflows/storage.yml
@@ -57,7 +57,7 @@ jobs:
       - name: Xcode
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: Setup simulator
-        uses: ./.github/actions/setup_simulator
+        uses: firebase/firebase-ios-sdk/.github/actions/setup_simulator@e1e760d7ab3a985cd590f284ad632afc7d192924 # main
         with:
           platform: ${{ matrix.os }}
       - name: Setup
diff --git a/scripts/setup_simulator.sh b/scripts/setup_simulator.sh
deleted file mode 100755
index b3b5e9b8a..000000000
--- a/scripts/setup_simulator.sh
+++ /dev/null
@@ -1,152 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright 2026 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# TODO: Temporary local copy of firebase/firebase-ios-sdk/scripts/setup_simulator.sh
-# (with SDK-major runtime matching and `macOS|catalyst` no-op support).
-# Consolidate once upstream `firebase-ios-sdk` supports cross-repo composite
-# action invocation.
-
-set -euo pipefail
-
-PLATFORM="${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
-
-  # Match the latest installed runtime for the active SDK's major version so it
-  # aligns with xcodebuild's implicit `OS:latest` destination resolution (e.g.,
-  # selecting iOS 26.5 on macos-26 when 26.2, 26.4, and 26.5 are installed).
-  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=$(xcrun simctl list runtimes available | grep "^[[:space:]]*${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 "^[[:space:]]*${platform_prefix}" | grep -o "com\.apple\.CoreSimulator\.SimRuntime\.${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 $sim_name. Skipping creation."
-    return 0
-  fi
-
-  if xcrun simctl list devices available | grep -Fq "${sim_name} ("; then
-    echo "✅ Simulator '$sim_name' already exists and is available."
-  else
-    # Clean up any existing (but unavailable) simulators with the same name to avoid duplicates
-    xcrun simctl list devices | grep -F "${sim_name} (" | grep -oE '[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}' | while read -r uuid; do
-      echo "🧹 Removing existing/unavailable simulator $uuid..."
-      xcrun simctl delete "$uuid" || true
-    done || true
-
-    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: $PLATFORM"
-    exit 1
-    ;;
-esac
diff --git a/scripts/test.sh b/scripts/test.sh
index d51922ae7..2e65c8d29 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -52,12 +52,6 @@ if [[ -z "${TEST:-}" ]]; then
     echo "Defaulting to TEST=$TEST"
 fi
 
-if [[ "$OS" == "iOS" || "$OS" == "tvOS" || "$OS" == "watchOS" ]]; then
-    if [[ "$DEVICE" == Firebase-* ]] && ! xcrun simctl list devices available | grep -Fq "${DEVICE} ("; then
-        bash ./scripts/setup_simulator.sh "$OS"
-    fi
-fi
-
 # Set have_secrets to true or false.
 have_secrets=false
 # shellcheck disable=SC1091