From 0e5ab60e9a4f87e5cfb18fda3a4e0d1d19aedee7 Mon Sep 17 00:00:00 2001
From: Moritz Angermann <moritz@zw3rk.com>
Date: Sat, 17 Oct 2026 02:33:27 +0900
Subject: [PATCH] ci: pin the legacy ARM Mac build to macOS 15

---
 .github/workflows/build.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a3400f3ffa..e52aeba74c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -586,7 +586,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-latest
+          # The CLT 27 SDK on macos-latest breaks GHC 9.6 hsc2hs linking.
+          - os: macos-15
             arch: aarch64
             ghc: ${{ needs.variables.outputs.GHC_VER }}
             cli_asset_name: simplex-chat-macos-aarch64