diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b6a4ec9..4de0582 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -44,3 +44,29 @@ jobs:
               "$PY" scripts/vendor_binaries.py --only gomc-rest-linux-amd64 &&
               "$PY" -m pytest -v
             '
+
+  # Real execution on Apple Silicon: confirms the ad-hoc-signed arm64 binary
+  # actually launches (Gatekeeper/signing behavior can't be judged by
+  # inspecting the binary offline). The Intel (amd64) binary is only verified
+  # offline (SHA-256 + Mach-O inspection) because GitHub's Intel macOS runners
+  # are not reliably schedulable here — they sat queued for 24h and were
+  # auto-cancelled.
+  test-macos:
+    runs-on: macos-14   # Apple Silicon
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0   # hatch-vcs derives the version from git tags
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install package and test deps
+        run: python -m pip install -e . pytest
+
+      - name: Vendor the macOS server binary
+        run: python scripts/vendor_binaries.py --only gomc-rest-darwin-arm64
+
+      - name: Run tests
+        run: python -m pytest -v
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1507cbb..a0d9857 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,10 +1,12 @@
 name: release
 
-# Build one platform-specific wheel per OS (each bundling only its matching
+# Build one platform-specific wheel per target (each bundling only its matching
 # gomc-rest binary) plus a binary-free sdist, and publish to PyPI on a version
-# tag. The sdist is the client-only fallback: on platforms without a matching
-# wheel (macOS, Windows arm64, glibc < 2.34), pip builds it so connect() still
-# works (launch() then raises a clear "binary not found/unsupported" error).
+# tag. All wheels cross-build on a single Linux runner (a wheel just zips the
+# pre-built binary). The sdist is the client-only fallback: on platforms
+# without a matching wheel (Windows arm64, glibc < 2.34, macOS < 12), pip
+# builds it so connect() still works (launch() then raises a clear "binary not
+# found/unsupported" error).
 on:
   push:
     tags:
@@ -14,25 +16,33 @@ on:
 jobs:
   build-wheels:
     name: wheel (${{ matrix.plat }})
-    runs-on: ${{ matrix.os }}
+    # A wheel just zips a pre-built binary and gets its platform tag forced by
+    # `wheel tags`, so the build host's OS/arch is irrelevant — everything
+    # cross-builds on one Linux runner (same idea as upstream gomc-rest, which
+    # cross-compiles all platforms from ubuntu). This avoids depending on
+    # scarce Windows/arm/macOS runners for releases.
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         include:
-          - os: windows-latest
-            asset: gomc-rest.exe
+          - asset: gomc-rest.exe
             plat: win_amd64
           # amd64 binary is dynamically linked and needs GLIBC_2.34, so it must
           # be tagged manylinux_2_34 (not 2014/glibc 2.17) or pip would install
           # it on older systems where it fails with "GLIBC_2.34 not found".
-          - os: ubuntu-latest
-            asset: gomc-rest-linux-amd64
+          - asset: gomc-rest-linux-amd64
             plat: manylinux_2_34_x86_64
           # arm64 binary is statically linked (no glibc dependency), so the
           # widest valid tag is fine.
-          - os: ubuntu-24.04-arm
-            asset: gomc-rest-linux-arm64
+          - asset: gomc-rest-linux-arm64
             plat: manylinux2014_aarch64
+          # Both darwin binaries declare a minimum OS of macOS 12 (Monterey)
+          # via LC_BUILD_VERSION, so the wheel must not claim an older floor.
+          - asset: gomc-rest-darwin-amd64
+            plat: macosx_12_0_x86_64
+          - asset: gomc-rest-darwin-arm64
+            plat: macosx_12_0_arm64
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/GOMC_REST_VERSION b/GOMC_REST_VERSION
index 0d0c52f..b7c0a9b 100644
--- a/GOMC_REST_VERSION
+++ b/GOMC_REST_VERSION
@@ -1 +1 @@
-v1.4.0
+v1.6.0
diff --git a/README.md b/README.md
index cbed687..d767cd3 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ Both `launch()` and `connect()` hand you the same `PLCClient`, so one package
 covers "bundle and run the server" and "just be a client".
 
 `connect()` needs no bundled binary, so it works even on platforms without a
-prebuilt wheel (macOS, Windows arm64, glibc < 2.34): there `pip install
+prebuilt wheel (Windows arm64, glibc < 2.34, macOS < 12): there `pip install
 gomc-rest` installs from the sdist, and only `launch()` is unavailable (it
 raises a clear error).
 
@@ -107,7 +107,7 @@ boundary is the trust boundary here.
 
 ## Versions
 
-This package bundles a pinned `gomc-rest` binary (currently **v1.4.0**, set in
+This package bundles a pinned `gomc-rest` binary (currently **v1.6.0**, set in
 `GOMC_REST_VERSION`) that must satisfy `gomc-rest-client`'s
 `MINIMUM_SUPPORTED_GOMC_REST_VERSION`; `launch()` verifies this on startup. The
 `gomc-rest-client` dependency is capped (`>=0.10.0,<0.11`) so a future client
diff --git a/README_JP.md b/README_JP.md
index 7285af5..2e1743a 100644
--- a/README_JP.md
+++ b/README_JP.md
@@ -71,7 +71,7 @@ with gomc_rest.connect("http://192.168.0.1:8080", token="...") as plc:
 同じ読み書きAPIを利用できます。
 
 `connect()` は同梱バイナリを必要としないため、対応するビルド済み `wheel` が
-ない環境（macOS、Windows arm64、glibc 2.34未満など）でも利用できます。
+ない環境（Windows arm64、glibc 2.34未満、macOS 12未満など）でも利用できます。
 その場合、`pip install gomc-rest` は `sdist` からパッケージをインストールします。
 `connect()` は利用できますが、`launch()` を実行すると、対応するバイナリが
 ないことを示すエラーが発生します。
@@ -117,7 +117,7 @@ finally:
 ## バージョン
 
 同梱するgomc-restのバージョンは `GOMC_REST_VERSION` で固定しています
-（現在は **v1.4.0**）。`launch()` は起動時に、サーバーが
+（現在は **v1.6.0**）。`launch()` は起動時に、サーバーが
 `gomc-rest-client` の `MINIMUM_SUPPORTED_GOMC_REST_VERSION` を満たしているか
 確認します。
 
diff --git a/RELEASING.md b/RELEASING.md
index 1fe7753..71acbc7 100644
--- a/RELEASING.md
+++ b/RELEASING.md
@@ -8,14 +8,26 @@ Pushing a `v*` tag runs `.github/workflows/release.yml`:
 
 1. **Version** — derived from the tag itself by hatch-vcs
    (`dynamic = ["version"]`); there is no version string to keep in sync.
-2. **Build wheels** (one per platform, each bundling only its matching
-   server binary, downloaded and SHA-256-verified at build time):
+2. **Build wheels** — all cross-build on a single `ubuntu-latest` runner
+   (a wheel just zips the matching binary, SHA-256-verified at build time,
+   then `wheel tags` forces the platform tag; the build host's OS/arch is
+   irrelevant, same as upstream gomc-rest cross-compiling from Linux):
    - `win_amd64` — `gomc-rest.exe`
    - `manylinux_2_34_x86_64` — `gomc-rest-linux-amd64` (dynamically linked,
      needs glibc ≥ 2.34; hence the 2_34 tag)
    - `manylinux2014_aarch64` — `gomc-rest-linux-arm64` (statically linked)
+   - `macosx_12_0_x86_64` — `gomc-rest-darwin-amd64` (unsigned)
+   - `macosx_12_0_arm64` — `gomc-rest-darwin-arm64` (ad-hoc signed)
+
+   Both darwin binaries declare a minimum OS of macOS 12 via
+   `LC_BUILD_VERSION`, hence the `macosx_12_0` tags. `ci.yml`'s
+   `test-macos` job actually launches the server on a real `macos-14`
+   (Apple Silicon) runner every PR — the authoritative check for
+   Gatekeeper/signing on arm64. The Intel binary is verified offline only
+   (SHA-256 + Mach-O inspection); GitHub's Intel macOS runners are not
+   reliably schedulable, so we don't gate on them.
 3. **Build sdist** — no binary; the client-only fallback for platforms
-   without a wheel (macOS, Windows arm64, older glibc).
+   without a wheel (Windows arm64, older glibc, macOS < 12).
 4. **Publish to PyPI** — trusted publishing (OIDC) via the `pypi`
    environment. `skip-existing` makes re-running a tag safe.
 5. **GitHub Release** — created only after PyPI publish succeeds, with
@@ -51,11 +63,15 @@ Only needed when changing the bundled server version:
    bump the client pin in `pyproject.toml` together if needed.
 2. Add `checksums/<version>.sha256` with the trusted SHA-256 of each
    release asset (`gomc-rest.exe`, `gomc-rest-linux-amd64`,
-   `gomc-rest-linux-arm64`). These are committed so a swapped release
+   `gomc-rest-linux-arm64`, `gomc-rest-darwin-amd64`,
+   `gomc-rest-darwin-arm64`). These are committed so a swapped release
    asset is detected; vendoring fails closed without them.
-3. If the new binaries change their glibc requirement (check with
+3. If the Linux binaries change their glibc requirement (check with
    `readelf -V <binary> | grep GLIBC`), update the `plat` tags in
-   `release.yml` and the CI floor test image in `ci.yml`.
+   `release.yml` and the CI floor test image in `ci.yml`. If the darwin
+   binaries change their minimum OS (check with `otool -l <binary> | grep
+   -A3 LC_BUILD_VERSION`, or parse the load command directly), update the
+   `macosx_*` tags in `release.yml`.
 
 ## Local builds (testing without PyPI)
 
diff --git a/checksums/v1.6.0.sha256 b/checksums/v1.6.0.sha256
new file mode 100644
index 0000000..1cbe77b
--- /dev/null
+++ b/checksums/v1.6.0.sha256
@@ -0,0 +1,5 @@
+21094f62a98516f83fb1900caf84fcba3f5ba303682189f7c180d37ff3d64e30  gomc-rest.exe
+314712bfddcc826fc5ff55a2087f9ae34e108adfbc88d1bbcc1d8609eb799f3d  gomc-rest-linux-amd64
+f9539bdf0f5952df6b33204c0a93c9513770ad2795df468872e66a80c3963129  gomc-rest-linux-arm64
+16bffdfea51e89ee3c83c6ae23ad485d6225f464c31e07ae38aa7e8646c13b36  gomc-rest-darwin-amd64
+649c0d889e37708b1e6c0fb4c8503a1fd0c7a82fc666e0a9b5a25f84e73f839e  gomc-rest-darwin-arm64
diff --git a/scripts/vendor_binaries.py b/scripts/vendor_binaries.py
index 9b6a9ed..c81d629 100644
--- a/scripts/vendor_binaries.py
+++ b/scripts/vendor_binaries.py
@@ -24,6 +24,8 @@
     "gomc-rest.exe",
     "gomc-rest-linux-amd64",
     "gomc-rest-linux-arm64",
+    "gomc-rest-darwin-amd64",
+    "gomc-rest-darwin-arm64",
 ]
 
 _ROOT = Path(__file__).resolve().parent.parent
diff --git a/src/gomc_rest/_binaries.py b/src/gomc_rest/_binaries.py
index 81450cc..76c5c0c 100644
--- a/src/gomc_rest/_binaries.py
+++ b/src/gomc_rest/_binaries.py
@@ -14,6 +14,8 @@
     ("windows", "amd64"): "gomc-rest.exe",
     ("linux", "amd64"): "gomc-rest-linux-amd64",
     ("linux", "arm64"): "gomc-rest-linux-arm64",
+    ("darwin", "amd64"): "gomc-rest-darwin-amd64",
+    ("darwin", "arm64"): "gomc-rest-darwin-arm64",
 }
 
 _MACHINE_ALIASES = {
diff --git a/src/gomc_rest/binaries/README.md b/src/gomc_rest/binaries/README.md
index 2eb4e40..641dfbb 100644
--- a/src/gomc_rest/binaries/README.md
+++ b/src/gomc_rest/binaries/README.md
@@ -3,11 +3,13 @@
 This directory holds the platform-specific `gomc-rest` server binaries that the
 Python package auto-launches (Pattern B):
 
-| Platform        | File name                |
-| --------------- | ------------------------ |
-| Windows (amd64) | `gomc-rest.exe`          |
-| Linux (amd64)   | `gomc-rest-linux-amd64`  |
-| Linux (arm64)   | `gomc-rest-linux-arm64`  |
+| Platform         | File name                 |
+| ---------------- | -------------------------- |
+| Windows (amd64)  | `gomc-rest.exe`            |
+| Linux (amd64)    | `gomc-rest-linux-amd64`    |
+| Linux (arm64)    | `gomc-rest-linux-arm64`    |
+| macOS (amd64)    | `gomc-rest-darwin-amd64`   |
+| macOS (arm64)    | `gomc-rest-darwin-arm64`   |
 
 The binaries are **not committed to git**. They are vendored in at release time
 from a pinned [gomc-rest](https://github.com/Moge800/gomc-rest) version, and each