From 22bec2066893033d08381d29a59b6d74f5614a0d Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Tue, 19 May 2026 07:41:25 +0300
Subject: [PATCH] gh-145098: Use `macos-26-intel` instead of `macos-15-intel`
 (GH-149991)

This reverts commit cb76ab3819f778e55a3f49ddb1f681ee20978eda.
(cherry picked from commit 517d3d2c10c7e6214d1785cf27f768809910e52c)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
---
 .github/workflows/build.yml          | 8 ++++----
 .github/workflows/reusable-macos.yml | 6 +++---
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6915d63ea362d28..fa214f10de0d5f0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -240,16 +240,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # macos-26 is Apple Silicon, 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-26
-        - macos-15-intel
+        - 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:
diff --git a/.github/workflows/reusable-macos.yml b/.github/workflows/reusable-macos.yml
index 65213e4a8d0ac46..6cb427a03713cf7 100644
--- a/.github/workflows/reusable-macos.yml
+++ b/.github/workflows/reusable-macos.yml
@@ -56,15 +56,15 @@ 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