From 965569a56dc2924b490320990fb99a7a17f9a5a3 Mon Sep 17 00:00:00 2001
From: clintonsteiner <47841949+clintonsteiner@users.noreply.github.com>
Date: Wed, 25 Mar 2026 06:15:46 -0500
Subject: [PATCH] gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe)
 (GH-145099) (cherry picked from commit
 4240c7dd7499c9024bae73a31fb25697203ae615)

Co-authored-by: clintonsteiner <47841949+clintonsteiner@users.noreply.github.com>
---
 .github/actionlint.yaml              |  5 +++++
 .github/workflows/build.yml          | 12 ++++++------
 .github/workflows/jit.yml            |  4 ++--
 .github/workflows/reusable-macos.yml |  6 +++---
 .github/workflows/tail-call.yml      |  4 ++--
 5 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/.github/actionlint.yaml b/.github/actionlint.yaml
index eacfff24889021..3004466b80e91c 100644
--- a/.github/actionlint.yaml
+++ b/.github/actionlint.yaml
@@ -1,3 +1,8 @@
+self-hosted-runner:
+  # Pending release of actionlint > 1.7.11 for macos-26-intel support
+  # https://github.com/rhysd/actionlint/pull/629
+  labels: ["macos-26-intel"]
+
 config-variables: null
 
 paths:
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index caa3f5ac6a897d..055fa7c0cdb7cc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -240,16 +240,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # macos-14 is M1, macos-15-intel is Intel.
-        # macos-15-intel only runs tests against the GIL-enabled CPython.
+        # macos-26 is Apple Silicon, macos-26-intel is Intel.
+        # macos-26-intel only runs tests against the GIL-enabled CPython.
         os:
-        - macos-14
-        - macos-15-intel
+        - macos-26
+        - macos-26-intel
         free-threading:
         - false
         - true
         exclude:
-        - os: macos-15-intel
+        - os: macos-26-intel
           free-threading: true
     uses: ./.github/workflows/reusable-macos.yml
     with:
@@ -369,7 +369,7 @@ jobs:
       matrix:
         include:
           - arch: aarch64
-            runs-on: macos-14
+            runs-on: macos-26
           - arch: x86_64
             runs-on: ubuntu-24.04
 
diff --git a/.github/workflows/jit.yml b/.github/workflows/jit.yml
index 1cdd746e0af5cb..81db07fffa5eeb 100644
--- a/.github/workflows/jit.yml
+++ b/.github/workflows/jit.yml
@@ -96,9 +96,9 @@ jobs:
           - false
         include:
           - target: x86_64-apple-darwin/clang
-            runner: macos-15-intel
+            runner: macos-26-intel
           - target: aarch64-apple-darwin/clang
-            runner: macos-14
+            runner: macos-26
     steps:
       - uses: actions/checkout@v6
         with:
diff --git a/.github/workflows/reusable-macos.yml b/.github/workflows/reusable-macos.yml
index 8291d30644ff51..c0274c7a964781 100644
--- a/.github/workflows/reusable-macos.yml
+++ b/.github/workflows/reusable-macos.yml
@@ -52,15 +52,15 @@ jobs:
           --prefix=/opt/python-dev \
           --with-openssl="$(brew --prefix openssl@3.0)"
     - name: Build CPython
-      if : ${{ inputs.free-threading || inputs.os != 'macos-15-intel' }}
+      if : ${{ inputs.free-threading || inputs.os != 'macos-26-intel' }}
       run: gmake -j8
     - name: Build CPython for compiler warning check
-      if : ${{ !inputs.free-threading && inputs.os == 'macos-15-intel' }}
+      if : ${{ !inputs.free-threading && inputs.os == 'macos-26-intel' }}
       run: set -o pipefail; gmake -j8 --output-sync 2>&1 | tee compiler_output_macos.txt
     - name: Display build info
       run: make pythoninfo
     - name: Check compiler warnings
-      if : ${{ !inputs.free-threading && inputs.os == 'macos-15-intel' }}
+      if : ${{ !inputs.free-threading && inputs.os == 'macos-26-intel' }}
       run: >-
         python3 Tools/build/check_warnings.py
         --compiler-output-file-path=compiler_output_macos.txt
diff --git a/.github/workflows/tail-call.yml b/.github/workflows/tail-call.yml
index ac8f47a881685e..f1e342bbac28a7 100644
--- a/.github/workflows/tail-call.yml
+++ b/.github/workflows/tail-call.yml
@@ -66,9 +66,9 @@ jobs:
       matrix:
         include:
           - target: x86_64-apple-darwin/clang
-            runner: macos-15-intel
+            runner: macos-26-intel
           - target: aarch64-apple-darwin/clang
-            runner: macos-14
+            runner: macos-26
     steps:
       - uses: actions/checkout@v6
         with: