diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6c806b6..bab7f96 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -83,9 +83,63 @@ jobs:
           name: server-release
           path: server-release/
 
+  build-binaries:
+    strategy:
+      matrix:
+        include:
+          - os: macos-latest
+            arch: arm64
+            artifact_name: modelica-language-server-macos-arm64
+          # Intel macOS. macos-13 was retired, so a job asking for it never gets
+          # a runner: it queues until the 24 h limit and is cancelled.
+          - os: macos-15-intel
+            arch: x64
+            artifact_name: modelica-language-server-macos-x64
+          - os: windows-latest
+            arch: x64
+            artifact_name: modelica-language-server-windows-x64.exe
+          # arm64 Linux. The x64 Linux binary comes from the `build` job above.
+          - os: ubuntu-24.04-arm
+            arch: arm64
+            artifact_name: modelica-language-server-linux-arm64
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+
+      - name: Install server dependencies
+        working-directory: server
+        run: npm ci
+
+      - name: Build standalone binary
+        working-directory: server
+        run: npm run build:standalone
+
+      - name: Stage binary
+        working-directory: server
+        shell: bash
+        run: |
+          mkdir -p ../server-release
+          if [ "${{ runner.os }}" = "Windows" ]; then
+            cp out/modelica-language-server.exe ../server-release/${{ matrix.artifact_name }}
+          else
+            cp out/modelica-language-server ../server-release/${{ matrix.artifact_name }}
+          fi
+
+      - name: Archive binary
+        uses: actions/upload-artifact@v7
+        with:
+          name: ${{ matrix.artifact_name }}
+          path: server-release/${{ matrix.artifact_name }}
+
   release:
     if: startsWith(github.ref, 'refs/tags/')
-    needs: build
+    needs: [build, build-binaries]
     runs-on: ubuntu-latest
     permissions:
       contents: write
@@ -106,6 +160,26 @@ jobs:
           name: server-release
           path: server-release/
 
+      - uses: actions/download-artifact@v8
+        with:
+          name: modelica-language-server-macos-arm64
+          path: server-release/
+
+      - uses: actions/download-artifact@v8
+        with:
+          name: modelica-language-server-macos-x64
+          path: server-release/
+
+      - uses: actions/download-artifact@v8
+        with:
+          name: modelica-language-server-windows-x64.exe
+          path: server-release/
+
+      - uses: actions/download-artifact@v8
+        with:
+          name: modelica-language-server-linux-arm64
+          path: server-release/
+
       - name: Release
         uses: softprops/action-gh-release@v3
         with:
@@ -115,6 +189,10 @@ jobs:
             server-release/tree-sitter-modelica.wasm
             server-release/web-tree-sitter.wasm
             server-release/modelica-language-server-linux-x64
+            server-release/modelica-language-server-linux-arm64
+            server-release/modelica-language-server-macos-arm64
+            server-release/modelica-language-server-macos-x64
+            server-release/modelica-language-server-windows-x64.exe
           fail_on_unmatched_files: true
           generate_release_notes: true
           append_body: true
diff --git a/server/scripts/build-standalone.js b/server/scripts/build-standalone.js
index 48478e6..261f7e8 100644
--- a/server/scripts/build-standalone.js
+++ b/server/scripts/build-standalone.js
@@ -20,7 +20,11 @@ const IS_WIN = process.platform === 'win32';
 const IS_MAC = process.platform === 'darwin';
 const BINARY_NAME = IS_WIN ? 'modelica-language-server.exe' : 'modelica-language-server';
 const OUT_BINARY = path.join(OUT_DIR, BINARY_NAME);
-const POSTJECT = path.join(__dirname, '..', 'node_modules', '.bin', 'postject');
+// Resolve postject's CLI script directly instead of the node_modules/.bin shim.
+// On Windows npm creates postject.cmd there (not a bare "postject" file), so
+// execFileSync of the bare name fails ENOENT. Invoking the JS entry under node
+// works uniformly across platforms.
+const POSTJECT_CLI = require.resolve('postject/dist/cli.js');
 
 function run(cmd, args, opts) {
   console.log(`  $ ${cmd} ${args.join(' ')}`);
@@ -53,7 +57,7 @@ const postjectArgs = [
 if (IS_MAC) {
   postjectArgs.push('--macho-segment-name', 'NODE_SEA');
 }
-run(POSTJECT, postjectArgs);
+run(process.execPath, [POSTJECT_CLI, ...postjectArgs]);
 
 // 4. Re-sign on macOS (ad-hoc, sufficient for local use; CI can use a real identity).
 if (IS_MAC) {