diff --git a/package.json b/package.json
index 468e64a29..4fd4b9368 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "generate": "npm-run-all build-protobuf transpile sass get-expire-time copy-and-concat",
     "build-release": "yarn run build",
     "sign-release": "node ts/updater/generateSignature.js",
-    "notarize": "node ts/build/notarize.js",
+    "notarize": "echo 'No longer necessary'",
     "get-strings": "node ts/scripts/get-strings.js",
     "get-expire-time": "node ts/scripts/get-expire-time.js",
     "copy-and-concat": "node ts/scripts/copy-and-concat.js",
diff --git a/ts/build/notarize.ts b/ts/build/notarize.ts
deleted file mode 100644
index b84c970c9..000000000
--- a/ts/build/notarize.ts
+++ /dev/null
@@ -1,90 +0,0 @@
-// Copyright 2019-2020 Signal Messenger, LLC
-// SPDX-License-Identifier: AGPL-3.0-only
-
-import { join, resolve } from 'path';
-import { readdir as readdirCallback } from 'fs';
-
-import pify from 'pify';
-
-import { notarize } from 'electron-notarize';
-
-import * as packageJson from '../../package.json';
-
-const readdir = pify(readdirCallback);
-
-/* eslint-disable no-console */
-
-go().catch(error => {
-  console.error(error.stack);
-
-  process.exit(1);
-});
-
-async function go() {
-  if (process.platform !== 'darwin') {
-    console.log('notarize: Skipping, not on macOS');
-
-    return;
-  }
-
-  const appPaths = await findDMGs();
-  const appBundleId = packageJson.build.appId;
-  if (!appBundleId) {
-    throw new Error(
-      'appBundleId must be provided in package.json: build.appId'
-    );
-  }
-
-  const appleId = process.env.APPLE_USERNAME;
-  if (!appleId) {
-    throw new Error(
-      'appleId must be provided in environment variable APPLE_USERNAME'
-    );
-  }
-
-  const appleIdPassword = process.env.APPLE_PASSWORD;
-  if (!appleIdPassword) {
-    throw new Error(
-      'appleIdPassword must be provided in environment variable APPLE_PASSWORD'
-    );
-  }
-
-  console.log('Notarizing with...');
-  console.log(`  primaryBundleId: ${appBundleId}`);
-  console.log(`  username: ${appleId}`);
-
-  for (const appPath of appPaths) {
-    console.log(`  file: ${appPath}`);
-
-    // eslint-disable-next-line no-await-in-loop
-    await notarize({
-      appBundleId,
-      appPath,
-      appleId,
-      appleIdPassword,
-    });
-  }
-}
-
-const IS_DMG = /\.dmg$/;
-async function findDMGs(): Promise<Array<string>> {
-  const releaseDir = resolve('release');
-  const files: Array<string> = await readdir(releaseDir);
-
-  const max = files.length;
-  const results = new Array<string>();
-  for (let i = 0; i < max; i += 1) {
-    const file = files[i];
-    const fullPath = join(releaseDir, file);
-
-    if (IS_DMG.test(file)) {
-      results.push(fullPath);
-    }
-  }
-
-  if (results.length === 0) {
-    throw new Error("No suitable files found in 'release' folder!");
-  }
-
-  return results;
-}
diff --git a/ts/scripts/after-pack.ts b/ts/scripts/after-pack.ts
index 48cf92812..2c6441d91 100644
--- a/ts/scripts/after-pack.ts
+++ b/ts/scripts/after-pack.ts
@@ -6,10 +6,14 @@ import { afterPack as fuseElectron } from './fuse-electron';
 import { afterPack as mergeASARs } from './merge-macos-asars';
 import { afterPack as copyPacks } from './copy-language-packs';
 import { afterPack as pruneMacOSRelease } from './prune-macos-release';
+import { afterPack as notarize } from './notarize';
 
 export async function afterPack(context: AfterPackContext): Promise<void> {
   await pruneMacOSRelease(context);
   await mergeASARs(context);
   await fuseElectron(context);
   await copyPacks(context);
+
+  // This must be the last step
+  await notarize(context);
 }
diff --git a/ts/scripts/notarize.ts b/ts/scripts/notarize.ts
new file mode 100644
index 000000000..04a76462d
--- /dev/null
+++ b/ts/scripts/notarize.ts
@@ -0,0 +1,62 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import path from 'path';
+import type { AfterPackContext } from 'electron-builder';
+
+import { notarize } from 'electron-notarize';
+
+import * as packageJson from '../../package.json';
+
+/* eslint-disable no-console */
+
+export async function afterPack({
+  appOutDir,
+  packager,
+  electronPlatformName,
+}: AfterPackContext): Promise<void> {
+  if (electronPlatformName !== 'darwin') {
+    console.log('notarize: Skipping, not on macOS');
+    return;
+  }
+
+  const { productFilename } = packager.appInfo;
+
+  const appPath = path.join(appOutDir, `${productFilename}.app`);
+
+  const appBundleId = packageJson.build.appId;
+  if (!appBundleId) {
+    throw new Error(
+      'appBundleId must be provided in package.json: build.appId'
+    );
+  }
+
+  const appleId = process.env.APPLE_USERNAME;
+  if (!appleId) {
+    console.warn(
+      'appleId must be provided in environment variable APPLE_USERNAME'
+    );
+    return;
+  }
+
+  const appleIdPassword = process.env.APPLE_PASSWORD;
+  if (!appleIdPassword) {
+    console.warn(
+      'appleIdPassword must be provided in environment variable APPLE_PASSWORD'
+    );
+    return;
+  }
+
+  console.log('Notarizing with...');
+  console.log(`  primaryBundleId: ${appBundleId}`);
+  console.log(`  username: ${appleId}`);
+  console.log(`  file: ${appPath}`);
+
+  // eslint-disable-next-line no-await-in-loop
+  await notarize({
+    appBundleId,
+    appPath,
+    appleId,
+    appleIdPassword,
+  });
+}