diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f3293be7..1f640241 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -73,7 +73,7 @@ jobs:
       operating-systems: >-
         ${{ github.event_name == 'pull_request'
             && '["ubuntu-latest"]'
-            || '["ubuntu-latest", "ubuntu-22.04", "macos-latest", "macos-14"]' }}
+            || '["ubuntu-latest", "ubuntu-22.04", "macos-latest", "macos-15"]' }}
     secrets:
       codecov_token: ${{ secrets.CODECOV_TOKEN }}
       sonar_token: ${{ secrets.SONAR_TOKEN }}
diff --git a/.github/workflows/release-python.yml b/.github/workflows/release-python.yml
index 6b4a8d8e..fea98577 100644
--- a/.github/workflows/release-python.yml
+++ b/.github/workflows/release-python.yml
@@ -413,7 +413,7 @@ jobs:
   build-macos-arm64:
     name: Build macosx_arm64 wheel
     needs: resolve
-    runs-on: macos-14  # Apple silicon runner
+    runs-on: macos-15  # Apple silicon runner
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7
       - name: Expand interpreter list for setup-python
diff --git a/.github/workflows/rw_build_and_test.yaml b/.github/workflows/rw_build_and_test.yaml
index 4cb361b1..22570175 100644
--- a/.github/workflows/rw_build_and_test.yaml
+++ b/.github/workflows/rw_build_and_test.yaml
@@ -12,7 +12,7 @@ on:
         description: "JSON array string of runner OSes for the test matrix. Callers pass [\"ubuntu-latest\"] for PRs and the full 4-OS list for push/scheduled/release."
         type: string
         required: false
-        default: '["ubuntu-latest", "ubuntu-22.04", "macos-latest", "macos-14"]'
+        default: '["ubuntu-latest", "ubuntu-22.04", "macos-latest", "macos-15"]'
     secrets:
       e2e_test_api_token:
         description: "Set the Slack bot token for end-to-end test."
diff --git a/.github/workflows/rw_run_all_test_and_record.yaml b/.github/workflows/rw_run_all_test_and_record.yaml
index a459cd4c..69f38eb9 100644
--- a/.github/workflows/rw_run_all_test_and_record.yaml
+++ b/.github/workflows/rw_run_all_test_and_record.yaml
@@ -12,7 +12,7 @@ on:
         description: "JSON array string of runner OSes for the test matrix. Forwarded to rw_build_and_test."
         type: string
         required: false
-        default: '["ubuntu-latest", "ubuntu-22.04", "macos-latest", "macos-14"]'
+        default: '["ubuntu-latest", "ubuntu-22.04", "macos-latest", "macos-15"]'
     secrets:
       e2e_test_api_token:
         description: "Set the Slack bot token for end-to-end test."