diff --git a/scripts/electron-builder.config.cjs b/scripts/electron-builder.config.cjs
index 019aa2c..04b31ae 100644
--- a/scripts/electron-builder.config.cjs
+++ b/scripts/electron-builder.config.cjs
@@ -96,6 +96,29 @@ function getFiles(buildTarget) {
     )
   }
 
+  if (buildTarget === 'mac') {
+    return appendUnique(
+      withoutItems(baseFiles, [
+        'node_modules/koffi/build/**/*',
+        '!node_modules/sherpa-onnx-node/bin/!(win-x64)/**/*',
+        '!node_modules/ffmpeg-static/bin/!(win32-x64)/**/*'
+      ]),
+      [
+        ...commonFiles,
+        '!node_modules/onnxruntime-node/bin/**/linux/**/*',
+        '!node_modules/onnxruntime-node/bin/**/win32/**/*',
+        'node_modules/onnxruntime-node/bin/**/darwin/**/*',
+        '!node_modules/sherpa-onnx-win-*/**/*',
+        '!node_modules/sherpa-onnx-linux-*/**/*',
+        'node_modules/sherpa-onnx-darwin-*/**/*',
+        '!node_modules/sherpa-onnx-node/node_modules/sherpa-onnx-win-*/**/*',
+        '!node_modules/sherpa-onnx-node/node_modules/sherpa-onnx-linux-*/**/*',
+        'node_modules/sherpa-onnx-node/node_modules/sherpa-onnx-darwin-*/**/*',
+        'node_modules/koffi/build/koffi/darwin_*/**/*'
+      ]
+    )
+  }
+
   return appendUnique(baseFiles, commonFiles)
 }
 
@@ -109,6 +132,13 @@ function getAsarUnpack(buildTarget) {
     )
   }
 
+  if (buildTarget === 'mac') {
+    return appendUnique(
+      withoutItems(baseAsarUnpack, ['node_modules/koffi/**/*']),
+      ['node_modules/koffi/build/koffi/darwin_*/**/*']
+    )
+  }
+
   return baseAsarUnpack
 }
 
diff --git a/scripts/run-electron-builder.cjs b/scripts/run-electron-builder.cjs
index 373c11e..20b60b9 100644
--- a/scripts/run-electron-builder.cjs
+++ b/scripts/run-electron-builder.cjs
@@ -13,6 +13,26 @@ if (!target || !['win', 'mac'].includes(target)) {
 const cliPath = require.resolve('electron-builder/cli.js')
 const configPath = path.join(__dirname, 'electron-builder.config.cjs')
 
+function cleanupBlockmapFiles(buildTarget) {
+  if (buildTarget !== 'mac') {
+    return
+  }
+
+  const releaseDir = path.join(__dirname, '..', 'release')
+  if (!fs.existsSync(releaseDir)) {
+    return
+  }
+
+  for (const name of fs.readdirSync(releaseDir)) {
+    if (!name.endsWith('.dmg.blockmap')) {
+      continue
+    }
+
+    fs.rmSync(path.join(releaseDir, name), { force: true })
+    console.log(`🧹 Removed obsolete blockmap: ${name}`)
+  }
+}
+
 const result = spawnSync(
   process.execPath,
   [cliPath, `--${target}`, '--publish', 'never', '--config', configPath],
@@ -33,3 +53,5 @@ const artifactName = target === 'mac'
 if (!fs.existsSync(path.join(__dirname, '..', artifactName))) {
   process.exit(result.status || 1)
 }
+
+cleanupBlockmapFiles(target)