diff --git a/.github/workflows/abtesting.yml b/.github/workflows/abtesting.yml
index 9c7bd5a1417..a1a50434bcc 100644
--- a/.github/workflows/abtesting.yml
+++ b/.github/workflows/abtesting.yml
@@ -50,6 +50,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/appdistribution.yml b/.github/workflows/appdistribution.yml
index 74670a14f2e..072ee73b9f4 100644
--- a/.github/workflows/appdistribution.yml
+++ b/.github/workflows/appdistribution.yml
@@ -46,6 +46,7 @@ jobs:
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
 
     strategy:
+      max-parallel: 1
       matrix:
         os: [macos-14, macos-13]
         include:
diff --git a/.github/workflows/auth.yml b/.github/workflows/auth.yml
index d3c3cdbb214..ecdafa27904 100644
--- a/.github/workflows/auth.yml
+++ b/.github/workflows/auth.yml
@@ -103,6 +103,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/core.yml b/.github/workflows/core.yml
index 5df6aad888a..d4913b5a428 100644
--- a/.github/workflows/core.yml
+++ b/.github/workflows/core.yml
@@ -43,6 +43,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/core_internal.yml b/.github/workflows/core_internal.yml
index f05eb0cfd0f..916e4d2a6b0 100644
--- a/.github/workflows/core_internal.yml
+++ b/.github/workflows/core_internal.yml
@@ -39,6 +39,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/crashlytics.yml b/.github/workflows/crashlytics.yml
index e7b78447c08..2abf8a6736b 100644
--- a/.github/workflows/crashlytics.yml
+++ b/.github/workflows/crashlytics.yml
@@ -57,6 +57,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/database.yml b/.github/workflows/database.yml
index 698f52ea6b4..4ff6742cfc2 100644
--- a/.github/workflows/database.yml
+++ b/.github/workflows/database.yml
@@ -68,6 +68,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/dynamiclinks.yml b/.github/workflows/dynamiclinks.yml
index f2679cc3fda..06b6d593664 100644
--- a/.github/workflows/dynamiclinks.yml
+++ b/.github/workflows/dynamiclinks.yml
@@ -43,6 +43,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         os: [macos-14, macos-13]
         include:
diff --git a/.github/workflows/firebase_app_check.yml b/.github/workflows/firebase_app_check.yml
index c2775348cb3..a4b03fe4a64 100644
--- a/.github/workflows/firebase_app_check.yml
+++ b/.github/workflows/firebase_app_check.yml
@@ -100,6 +100,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-14, macos-13]
diff --git a/.github/workflows/functions.yml b/.github/workflows/functions.yml
index bac9f2c2457..db67ea823f4 100644
--- a/.github/workflows/functions.yml
+++ b/.github/workflows/functions.yml
@@ -56,6 +56,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         os: [macos-14]
         include:
diff --git a/.github/workflows/inappmessaging.yml b/.github/workflows/inappmessaging.yml
index efec2295431..76eea952f23 100644
--- a/.github/workflows/inappmessaging.yml
+++ b/.github/workflows/inappmessaging.yml
@@ -70,6 +70,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         os: [macos-14, macos-13]
         include:
diff --git a/.github/workflows/installations.yml b/.github/workflows/installations.yml
index 2b103346226..744e11c10a6 100644
--- a/.github/workflows/installations.yml
+++ b/.github/workflows/installations.yml
@@ -61,6 +61,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         # TODO: macos tests are blocked by https://github.com/erikdoe/ocmock/pull/532
         target: [iOS, tvOS, macOS, watchOS, catalyst]
diff --git a/.github/workflows/messaging.yml b/.github/workflows/messaging.yml
index 93aa3669a03..6aa8fdc0091 100644
--- a/.github/workflows/messaging.yml
+++ b/.github/workflows/messaging.yml
@@ -82,6 +82,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, watchOS, tvOS, macOS, catalyst]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/mlmodeldownloader.yml b/.github/workflows/mlmodeldownloader.yml
index 24b59960440..a0d2cd992cc 100644
--- a/.github/workflows/mlmodeldownloader.yml
+++ b/.github/workflows/mlmodeldownloader.yml
@@ -73,6 +73,7 @@ jobs:
   spm:
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index ce0a4ac8790..059253fabfb 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -127,6 +127,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS]
         include:
diff --git a/.github/workflows/remoteconfig.yml b/.github/workflows/remoteconfig.yml
index 0792a706f77..382068cd980 100644
--- a/.github/workflows/remoteconfig.yml
+++ b/.github/workflows/remoteconfig.yml
@@ -58,6 +58,7 @@ jobs:
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
 
     strategy:
+      max-parallel: 1
       matrix:
         # TODO: macos tests are blocked by https://github.com/erikdoe/ocmock/pull/532
         target: [ios, tvos, macos --skip-tests, watchos]
diff --git a/.github/workflows/sessions.yml b/.github/workflows/sessions.yml
index 11ffd2f942d..a80387bab95 100644
--- a/.github/workflows/sessions.yml
+++ b/.github/workflows/sessions.yml
@@ -53,6 +53,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/shared-swift.yml b/.github/workflows/shared-swift.yml
index 4b1cbcb3383..4b6ea4a12e1 100644
--- a/.github/workflows/shared-swift.yml
+++ b/.github/workflows/shared-swift.yml
@@ -45,6 +45,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/storage.yml b/.github/workflows/storage.yml
index 4409dadc0ca..50fb4f7b2ef 100644
--- a/.github/workflows/storage.yml
+++ b/.github/workflows/storage.yml
@@ -63,6 +63,7 @@ jobs:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, tvOS, macOS, catalyst, watchOS]
         os: [macos-13, macos-14]
diff --git a/.github/workflows/vertexai.yml b/.github/workflows/vertexai.yml
index 3e9bf41e292..3a33c8ded29 100644
--- a/.github/workflows/vertexai.yml
+++ b/.github/workflows/vertexai.yml
@@ -17,6 +17,7 @@ concurrency:
 jobs:
   spm-unit:
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS, macOS, catalyst, tvOS, visionOS, watchOS]
         os: [macos-14]
@@ -44,6 +45,7 @@ jobs:
 
   spm-integration:
     strategy:
+      max-parallel: 1
       matrix:
         target: [iOS]
         os: [macos-14]