diff --git a/package.json b/package.json
index 296652b2d4..d17c41c805 100644
--- a/package.json
+++ b/package.json
@@ -200,6 +200,7 @@
     "@electron/fuses": "1.5.0",
     "@electron/notarize": "2.1.0",
     "@formatjs/intl": "2.6.7",
+    "@indutny/rezip-electron": "1.3.1",
     "@mixer/parallel-prettier": "2.0.3",
     "@signalapp/mock-server": "5.1.0",
     "@storybook/addon-a11y": "7.4.5",
@@ -444,6 +445,7 @@
         "signalcaptcha"
       ]
     },
+    "artifactBuildCompleted": "ts/scripts/artifact-build-completed.js",
     "afterSign": "ts/scripts/after-sign.js",
     "afterPack": "ts/scripts/after-pack.js",
     "afterAllArtifactBuild": "ts/scripts/after-all-artifact-build.js",
diff --git a/ts/scripts/artifact-build-completed.ts b/ts/scripts/artifact-build-completed.ts
new file mode 100644
index 0000000000..635896e7bf
--- /dev/null
+++ b/ts/scripts/artifact-build-completed.ts
@@ -0,0 +1,57 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { tmpdir } from 'os';
+import { mkdtemp, rm, rename, stat } from 'fs/promises';
+import { createReadStream } from 'fs';
+import { pipeline } from 'stream/promises';
+import { createHash } from 'crypto';
+import path from 'path';
+import type { ArtifactCreated } from 'electron-builder';
+
+export async function artifactBuildCompleted({
+  target,
+  file,
+  packager,
+  updateInfo,
+}: ArtifactCreated): Promise<void> {
+  if (packager.platform.name !== 'mac') {
+    return;
+  }
+  if (target?.name !== 'zip') {
+    return;
+  }
+  if (!file.endsWith('.zip')) {
+    return;
+  }
+
+  // ESM module
+  const { optimize } = await import('@indutny/rezip-electron');
+
+  const tmpFolder = await mkdtemp(path.join(tmpdir(), 'rezip'));
+  const optimizedPath = path.join(tmpFolder, path.basename(file));
+
+  try {
+    console.log(`Optimizing ${file} => ${optimizedPath}`);
+
+    await optimize({
+      inputPath: file,
+      outputPath: optimizedPath,
+      blockMapPath: `${file}.blockmap`,
+    });
+
+    console.log(`Replacing ${file}`);
+    await rename(optimizedPath, file);
+  } finally {
+    await rm(tmpFolder, { recursive: true });
+  }
+
+  console.log('Updating hash and size');
+  const sha512 = createHash('sha512');
+  await pipeline(createReadStream(file), sha512);
+  // eslint-disable-next-line no-param-reassign
+  updateInfo.sha512 = sha512.digest('base64');
+  const { size } = await stat(file);
+  // eslint-disable-next-line no-param-reassign
+  updateInfo.size = size;
+}
diff --git a/yarn.lock b/yarn.lock
index 0c0ae16fc2..aacb98afb5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1903,11 +1903,29 @@
   resolved "https://registry.yarnpkg.com/@humanwhocodes/object-schema/-/object-schema-2.0.2.tgz#d9fae00a2d5cb40f92cfe64b47ad749fbc38f917"
   integrity sha512-6EwiSjwWYP7pTckG6I5eyFANjPhmPjUX9JRLUSfNPC7FX7zK9gyZAfUEaECL6ALTpGX5AjnBq3C9XmVWPitNpw==
 
+"@indutny/rezip-electron@1.3.1":
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/@indutny/rezip-electron/-/rezip-electron-1.3.1.tgz#b131a023bac540458e8974db16705e08b6beefb8"
+  integrity sha512-tRH4WTmIMYnCQf7UUGaUM9vKiiUIcPWqA6wTHo7A3vwqMR5Yjr28gvp0DToZr94kJZ4dmfIinvTcNk6uJo+TfQ==
+  dependencies:
+    "@indutny/yazl" "^2.7.0"
+    better-blockmap "^1.0.2"
+    commander "^12.0.0"
+    functional-red-black-tree "^1.0.1"
+    yauzl "^3.1.0"
+
 "@indutny/sneequals@4.0.0":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/@indutny/sneequals/-/sneequals-4.0.0.tgz#94f74e577019759c5d12818e7c7ff1b9300653a4"
   integrity sha512-kQUBQtcm4aVqJil+KRfA7SycJqcWlFEa7MJTYyl4XAahHOPXnzgqvlzUPQOw1tRFlvnzxRpXNUpJxej2fdAPjg==
 
+"@indutny/yazl@^2.7.0":
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/@indutny/yazl/-/yazl-2.7.0.tgz#34e46310ef252998e93a9f18315fcfe0c885b326"
+  integrity sha512-6igFZsYj7BVSTIJ8qhWvsPp0adMY62IJe4xHwQTpoMvbFlalRdpYXsL9wDaAiwt76CtyPlcT7SBNBEKkDbcQyg==
+  dependencies:
+    buffer-crc32 "~0.2.3"
+
 "@internationalized/date@^3.2.0":
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/@internationalized/date/-/date-3.2.0.tgz#1d266e5e5543a059cf8cca9b954fa033c3e58a75"
@@ -7044,6 +7062,13 @@ before-after-hook@^2.2.0:
   resolved "https://registry.yarnpkg.com/before-after-hook/-/before-after-hook-2.2.2.tgz#a6e8ca41028d90ee2c24222f201c90956091613e"
   integrity sha512-3pZEU3NT5BFUo/AD5ERPWOgQOCZITni6iavr5AUw5AUwQjMlI0kzu5btnyD39AF0gUEsDPwJT+oY1ORBJijPjQ==
 
+better-blockmap@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/better-blockmap/-/better-blockmap-1.0.2.tgz#04f99f6115775e9b4bcbd26c34ec651a01b3865a"
+  integrity sha512-D6Fp7QuPcO1mlCbOM8MigD66B/uqSlLXilGkK7Fo8XkMy4Zxh7oFeLORnlGhkQqrbJsrKKchuRGaEo0jCvh61Q==
+  dependencies:
+    yargs "^17.3.1"
+
 better-opn@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/better-opn/-/better-opn-3.0.2.tgz#f96f35deaaf8f34144a4102651babcf00d1d8817"
@@ -7879,6 +7904,11 @@ combined-stream@^1.0.6, combined-stream@^1.0.8:
   dependencies:
     delayed-stream "~1.0.0"
 
+commander@^12.0.0:
+  version "12.0.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-12.0.0.tgz#b929db6df8546080adfd004ab215ed48cf6f2592"
+  integrity sha512-MwVNWlYjDTtOjX5PiD7o5pK0UrFU/OYgcJfjjK4RaHZETNtjJqrZa9Y9ds88+A+f+d5lv+561eZ+yCKoS3gbAA==
+
 commander@^2.18.0, commander@^2.19.0, commander@^2.20.0:
   version "2.20.3"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
@@ -10706,6 +10736,11 @@ function.prototype.name@^1.1.5:
     es-abstract "^1.19.0"
     functions-have-names "^1.2.2"
 
+functional-red-black-tree@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/functional-red-black-tree/-/functional-red-black-tree-1.0.1.tgz#1b0ab3bd553b2a0d6399d29c0e3ea0b252078327"
+  integrity sha512-dsKNQNdj6xA3T+QlADDA7mOSlX0qiMINjn0cgr+eGHGsbSHzTabcIogz2+p/iqP1Xs6EP/sS2SbqH+brGTbq0g==
+
 functions-have-names@^1.2.2, functions-have-names@^1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/functions-have-names/-/functions-have-names-1.2.3.tgz#0404fe4ee2ba2f607f0e0ec3c80bae994133b834"
@@ -20282,6 +20317,14 @@ yauzl@^2.10.0:
     buffer-crc32 "~0.2.3"
     fd-slicer "~1.1.0"
 
+yauzl@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/yauzl/-/yauzl-3.1.0.tgz#6ebf3c3bb11372dd45e458e78aa5571a9a422223"
+  integrity sha512-zbff6SaAPyewVextulqeBjJm+1ZhS69vSN7cRpqVD7jMNSE9oXEdQ1SGF+ydfB+gKE2a3GiWfXf/pnwVZ1/tOA==
+  dependencies:
+    buffer-crc32 "~0.2.3"
+    pend "~1.2.0"
+
 yn@^3.0.0:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"