diff --git a/.github/workflows/dslings-ref-ci.yml b/.github/workflows/dslings-ref-ci.yml
index 089f700..a76a0de 100644
--- a/.github/workflows/dslings-ref-ci.yml
+++ b/.github/workflows/dslings-ref-ci.yml
@@ -57,7 +57,7 @@ jobs:
       matrix:
         include:
           - {name: linux, os: ubuntu-24.04, langs: all}
-          - {name: macos-arm64, os: macos-14, langs: zh}
+          - {name: macos-arm64, os: macos-15, langs: zh}
           - {name: windows-server-2022, os: windows-2022, langs: zh}
           - {name: windows-server-2025, os: windows-2025, langs: zh}
           - {name: windows-no-msvc, os: windows-2025, langs: zh, mask_msvc: true}
diff --git a/.github/workflows/environment-lifecycle.yml b/.github/workflows/environment-lifecycle.yml
index 8448d65..0d18f9f 100644
--- a/.github/workflows/environment-lifecycle.yml
+++ b/.github/workflows/environment-lifecycle.yml
@@ -54,7 +54,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, macos-14, windows-2025]
+        os: [ubuntu-24.04, macos-15, windows-2025]
         variant: [existing]
         include:
           - {os: ubuntu-24.04, variant: broken-glibc}
diff --git a/.github/workflows/fresh-install.yml b/.github/workflows/fresh-install.yml
index cedd1c8..d340f99 100644
--- a/.github/workflows/fresh-install.yml
+++ b/.github/workflows/fresh-install.yml
@@ -74,7 +74,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-14, windows-2022, windows-2025]
+        os: [macos-15, windows-2022, windows-2025]
         route: [readme, cold]
         mask_msvc: [false]
         include:
@@ -270,7 +270,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, macos-14, windows-2025]
+        os: [ubuntu-24.04, macos-15, windows-2025]
     steps:
       - uses: actions/checkout@v4
       - name: Install xlings (Unix)