diff --git a/.github/workflows/auth.yml b/.github/workflows/auth.yml
index c9e3acd7874..1f2055c1499 100644
--- a/.github/workflows/auth.yml
+++ b/.github/workflows/auth.yml
@@ -121,7 +121,7 @@ jobs:
         scripts/decrypt_gha_secret.sh scripts/gha-encrypted/AuthSample/Credentials.swift.gpg \
           FirebaseAuth/Tests/SampleSwift/SwiftApiTests/Credentials.swift "$plist_secret"
     - name: Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
     - uses: nick-fields/retry@ce71cc2ab81d554ebbe88c79ab5975992d79ba08 # v3
       with:
         timeout_minutes: 120
diff --git a/.github/workflows/common.yml b/.github/workflows/common.yml
index 60ee27117af..d9eac3c9a12 100644
--- a/.github/workflows/common.yml
+++ b/.github/workflows/common.yml
@@ -74,7 +74,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-15]
-        xcode: [Xcode_16.2]
+        xcode: [Xcode_16.3]
         platform: [iOS, tvOS, macOS, watchOS, catalyst, visionOS]
         include:
           - os: macos-14
diff --git a/.github/workflows/database.yml b/.github/workflows/database.yml
index 95230d9286a..daa245a17f6 100644
--- a/.github/workflows/database.yml
+++ b/.github/workflows/database.yml
@@ -72,7 +72,7 @@ jobs:
     - name: Install xcpretty
       run: gem install xcpretty
     - name: Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
     - name: IntegrationTest
       # Only iOS to mitigate flakes.
       run: scripts/third_party/travis/retry.sh scripts/build.sh Database iOS integration
diff --git a/.github/workflows/functions.yml b/.github/workflows/functions.yml
index 0afb8ca1926..a44b1a603bb 100644
--- a/.github/workflows/functions.yml
+++ b/.github/workflows/functions.yml
@@ -33,7 +33,7 @@ jobs:
         target: [ios, tvos, macos, watchos]
         build-env:
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
     runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
@@ -80,8 +80,8 @@ jobs:
     needs: [spm-package-resolved]
     strategy:
       matrix:
-        os: [macos-14]
-        xcode: [Xcode_16.2]
+        os: [macos-15]
+        xcode: [Xcode_16.3]
     runs-on: ${{ matrix.os }}
     env:
       FIREBASECI_USE_LATEST_GOOGLEAPPMEASUREMENT: 1
@@ -115,22 +115,22 @@ jobs:
             xcode: Xcode_16.2
             target: iOS
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             target: iOS
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             target: tvOS
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             target: macOS
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             target: watchOS
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             target: catalyst
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             target: visionOS
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/installations.yml b/.github/workflows/installations.yml
index acef876c753..6c97e8b82fc 100644
--- a/.github/workflows/installations.yml
+++ b/.github/workflows/installations.yml
@@ -43,7 +43,7 @@ jobs:
             xcode: Xcode_16.2
             test-specs: unit,integration
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             test-specs: unit
     runs-on: ${{ matrix.build-env.os }}
     steps:
diff --git a/.github/workflows/messaging.yml b/.github/workflows/messaging.yml
index 390be1250cd..22728cbfa03 100644
--- a/.github/workflows/messaging.yml
+++ b/.github/workflows/messaging.yml
@@ -51,7 +51,7 @@ jobs:
       run: scripts/configure_test_keychain.sh
     - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
     - name: Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Install xcpretty
@@ -76,7 +76,7 @@ jobs:
             xcode: Xcode_16.2
             tests: --test-specs=unit
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             tests: --skip-tests
     runs-on: ${{ matrix.build-env.os }}
     steps:
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index 066964ca71c..cefd7fb083c 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -73,7 +73,7 @@ jobs:
           - os: macos-14
             xcode: Xcode_16.2
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
     runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/remoteconfig.yml b/.github/workflows/remoteconfig.yml
index a32596de24c..d1b9bd1a9e5 100644
--- a/.github/workflows/remoteconfig.yml
+++ b/.github/workflows/remoteconfig.yml
@@ -164,7 +164,7 @@ jobs:
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
     - name: Prereqs
       run: scripts/install_prereqs.sh RemoteConfigSample iOS
     - name: Build
diff --git a/.github/workflows/sessions.yml b/.github/workflows/sessions.yml
index 77408cfdd58..f5372a2091b 100644
--- a/.github/workflows/sessions.yml
+++ b/.github/workflows/sessions.yml
@@ -41,7 +41,7 @@ jobs:
             tests:
           # Flaky tests on CI
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             tests: --skip-tests
     runs-on: ${{ matrix.build-env.os }}
     steps:
diff --git a/.github/workflows/shared-swift.yml b/.github/workflows/shared-swift.yml
index fe1b1e20303..2cba3d10649 100644
--- a/.github/workflows/shared-swift.yml
+++ b/.github/workflows/shared-swift.yml
@@ -37,7 +37,7 @@ jobs:
             xcode: Xcode_16.2
             swift_version: 5.9
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             swift_version: 6.0
     runs-on: ${{ matrix.build-env.os }}
     steps:
diff --git a/.github/workflows/spm.yml b/.github/workflows/spm.yml
index c9ef94844cd..4c7faad3814 100644
--- a/.github/workflows/spm.yml
+++ b/.github/workflows/spm.yml
@@ -59,7 +59,7 @@ jobs:
       matrix:
         include:
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
             test: spm
           - os: macos-14
             xcode: Xcode_16.2
diff --git a/.github/workflows/storage.yml b/.github/workflows/storage.yml
index 364f003209b..14577436e56 100644
--- a/.github/workflows/storage.yml
+++ b/.github/workflows/storage.yml
@@ -37,7 +37,7 @@ jobs:
         language: [Swift, ObjC]
         include:
           - os: macos-15
-            xcode: Xcode_16.2
+            xcode: Xcode_16.3
     env:
       plist_secret: ${{ secrets.GHASecretsGPGPassphrase1 }}
     runs-on: ${{ matrix.os }}
diff --git a/.github/workflows/symbolcollision.yml b/.github/workflows/symbolcollision.yml
index 88a44e75cb6..51fc88e262c 100644
--- a/.github/workflows/symbolcollision.yml
+++ b/.github/workflows/symbolcollision.yml
@@ -32,7 +32,7 @@ jobs:
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
     - name: Prereqs
       run: scripts/install_prereqs.sh SymbolCollision iOS
     - name: Build