diff --git a/.github/workflows/nightly.yaml b/.github/workflows/nightly.yaml
index 558e3be93c..58eda3ca2e 100644
--- a/.github/workflows/nightly.yaml
+++ b/.github/workflows/nightly.yaml
@@ -21,6 +21,7 @@ jobs:
             xcode: ^26
           - ios: ^18
             xcode: ^16
+            macos: macos-15
     uses: ./.github/workflows/reusable-test-workflow.yaml
     permissions:
       contents: read
@@ -29,6 +30,7 @@ jobs:
       lib: ${{ matrix.lib }}
       ios: ${{ matrix.ios }}
       xcode: ${{ matrix.xcode }}
+      macos: ${{ matrix.macos }}
     secrets:
       TEST_CREDENTIALS: ${{ secrets.TEST_CREDENTIALS }}
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
@@ -44,6 +46,7 @@ jobs:
             xcode: ^26
           - ios: ^18
             xcode: ^16
+            macos: macos-15
     uses: ./.github/workflows/reusable-build-workflow.yaml
     permissions:
       contents: read
@@ -51,3 +54,4 @@ jobs:
       app: ${{ matrix.app }}
       ios: ${{ matrix.ios }}
       xcode: ${{ matrix.xcode }}
+      macos: ${{ matrix.macos }}
diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index f2f4bbd146..12358a2f33 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -137,6 +137,7 @@ jobs:
             xcode: ^26
           - ios: ^18
             xcode: ^16
+            macos: macos-15
     uses: ./.github/workflows/reusable-test-workflow.yaml
     permissions:
       contents: read
@@ -145,6 +146,7 @@ jobs:
       lib: ${{ matrix.lib }}
       ios: ${{ matrix.ios }}
       xcode: ${{ matrix.xcode }}
+      macos: ${{ matrix.macos }}
       is_pr: true
     secrets:
       TEST_CREDENTIALS: ${{ secrets.TEST_CREDENTIALS }}
@@ -162,6 +164,7 @@ jobs:
             xcode: ^26
           - ios: ^18
             xcode: ^16
+            macos: macos-15
     uses: ./.github/workflows/reusable-build-workflow.yaml
     permissions:
       contents: read
@@ -169,6 +172,7 @@ jobs:
       app: ${{ matrix.app }}
       ios: ${{ matrix.ios }}
       xcode: ${{ matrix.xcode }}
+      macos: ${{ matrix.macos }}
       is_pr: true
 
   ui-tests-pr:
@@ -182,6 +186,7 @@ jobs:
             xcode: ^26
           - ios: ^18
             xcode: ^16
+            macos: macos-15
     uses: ./.github/workflows/reusable-ui-test-workflow.yaml
     permissions:
       contents: read
@@ -190,6 +195,7 @@ jobs:
       is_pr: true
       ios: ${{ matrix.ios }}
       xcode: ${{ matrix.xcode }}
+      macos: ${{ matrix.macos }}
       run_all_ui_tests: ${{ needs.test-orchestrator.outputs.run_all_ui_tests == 'true' }}
       pr_test: "AuthFlowTesterUITests/LegacyLoginTests/testCAOpaque_DefaultScopes_WebServerFlow"
       short_timeout: "3"
diff --git a/.github/workflows/ui-test-nightly.yaml b/.github/workflows/ui-test-nightly.yaml
index 684b90fc47..543cee753a 100644
--- a/.github/workflows/ui-test-nightly.yaml
+++ b/.github/workflows/ui-test-nightly.yaml
@@ -19,6 +19,7 @@ jobs:
             xcode: ^26
           - ios: ^18
             xcode: ^16
+            macos: macos-15
     uses: ./.github/workflows/reusable-ui-test-workflow.yaml
     permissions:
       contents: read
@@ -26,6 +27,7 @@ jobs:
     with:
       ios: ${{ matrix.ios }}
       xcode: ${{ matrix.xcode }}
+      macos: ${{ matrix.macos }}
       short_timeout: "3"
       long_timeout: "15"
     secrets: