diff --git a/.github/workflows/cli-tests.yml b/.github/workflows/cli-tests.yml
index 2996bf4..15808f1 100644
--- a/.github/workflows/cli-tests.yml
+++ b/.github/workflows/cli-tests.yml
@@ -1,7 +1,7 @@
 name: CLI tests
 
 # Build ("compile") and test the Python command-line tool across Linux,
-# Windows, and macOS Apple Silicon (macos-14, running natively on arm64). The
+# Windows, and macOS Apple Silicon (macos-15, running natively on arm64). The
 # tests use a fake sonpy shim, so they do not require CED's sonpy binaries.
 
 on:
@@ -29,7 +29,7 @@ jobs:
             python-version: '3.11'
           - os: windows-latest   # Windows
             python-version: '3.11'
-          - os: macos-14         # macOS Apple Silicon
+          - os: macos-15         # macOS Apple Silicon
             python-version: '3.11'
 
     steps:
diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index 8be2a23..d1c95c8 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -5,7 +5,7 @@ name: Integration tests (real sonpy)
 #
 # CED ships sonpy wheels for Python 3.14 on manylinux, macOS and Windows.
 # Note: CED's macOS wheel is labelled universal2 but actually contains an
-# x86_64-only binary (no native arm64). On Apple Silicon (macos-14) we
+# x86_64-only binary (no native arm64). On Apple Silicon (macos-15) we
 # therefore run every Python command through `arch -x86_64`, which executes the
 # x86_64 slice of the universal2 python.org interpreter under Rosetta 2 so the
 # x86_64 sonpy loads. Other platforms run their native x86_64 Python. (The
@@ -37,7 +37,7 @@ jobs:
             py: python
           - os: windows-latest   # Windows
             py: python
-          - os: macos-14         # macOS Apple Silicon -> x86_64 under Rosetta
+          - os: macos-15         # macOS Apple Silicon -> x86_64 under Rosetta
             py: arch -x86_64 python
 
     steps:
diff --git a/.github/workflows/matlab-tests.yml b/.github/workflows/matlab-tests.yml
index 98ec906..6bba9bf 100644
--- a/.github/workflows/matlab-tests.yml
+++ b/.github/workflows/matlab-tests.yml
@@ -2,7 +2,7 @@ name: MATLAB tests
 
 # matbox-style CI (mirroring VH-Lab/NDR-matlab) for the +sonpipe MATLAB
 # wrappers. Runs the matlab.unittest suite across Linux, Windows, and macOS
-# Apple Silicon (macos-14). The MATLAB tests drive a fake sonpipe CLI
+# Apple Silicon (macos-15). The MATLAB tests drive a fake sonpipe CLI
 # (Python + numpy), so CED's sonpy binaries are not required.
 #
 # Licensing: matlab-actions provides MathWorks licensing for free on PUBLIC
@@ -33,7 +33,7 @@ jobs:
         os:
           - ubuntu-latest    # Linux
           - windows-latest   # Windows
-          - macos-14         # macOS Apple Silicon
+          - macos-15         # macOS Apple Silicon
 
     steps:
       - name: Check out repository