diff --git a/package.json b/package.json
index c67366ad..8b354817 100644
--- a/package.json
+++ b/package.json
@@ -128,6 +128,7 @@
     "is-wsl": "^3.0.0",
     "jiti": "^1.21.0",
     "json5": "^2.2.3",
+    "jszip": "^3.10.1",
     "linkedom": "^0.16.1",
     "minimatch": "^9.0.3",
     "natural-compare": "^1.4.0",
@@ -139,8 +140,7 @@
     "unimport": "^3.4.0",
     "vite": "^5.1.3",
     "web-ext-run": "^0.2.0",
-    "webextension-polyfill": "^0.10.0",
-    "zip-dir": "^2.0.0"
+    "webextension-polyfill": "^0.10.0"
   },
   "devDependencies": {
     "@faker-js/faker": "^8.3.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 92d69cc1..15c742d4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -74,6 +74,9 @@ importers:
       json5:
         specifier: ^2.2.3
         version: 2.2.3
+      jszip:
+        specifier: ^3.10.1
+        version: 3.10.1
       linkedom:
         specifier: ^0.16.1
         version: 0.16.1
@@ -110,9 +113,6 @@ importers:
       webextension-polyfill:
         specifier: ^0.10.0
         version: 0.10.0
-      zip-dir:
-        specifier: ^2.0.0
-        version: 2.0.0
     devDependencies:
       '@faker-js/faker':
         specifier: ^8.3.1
diff --git a/src/core/zip.ts b/src/core/zip.ts
index 19ef3844..20f10105 100644
--- a/src/core/zip.ts
+++ b/src/core/zip.ts
@@ -1,6 +1,5 @@
 import { InlineConfig } from '~/types';
-import zipdir from 'zip-dir';
-import { dirname, relative, resolve } from 'node:path';
+import path from 'node:path';
 import fs from 'fs-extra';
 import { kebabCaseAlphanumeric } from '~/core/utils/strings';
 import { getPackageJson } from '~/core/utils/package';
@@ -9,10 +8,12 @@ import { formatDuration } from '~/core/utils/time';
 import { printFileList } from '~/core/utils/log/printFileList';
 import { internalBuild } from '~/core/utils/building';
 import { registerWxt, wxt } from './wxt';
+import JSZip from 'jszip';
+import glob from 'fast-glob';
 
 /**
  * Build and zip the extension for distribution.
- * @param config Opitonal config that will override your `<root>/wxt.config.ts`.
+ * @param config Optional config that will override your `<root>/wxt.config.ts`.
  * @returns A list of all files included in the ZIP.
  */
 export async function zip(config?: InlineConfig): Promise<string[]> {
@@ -26,7 +27,7 @@ export async function zip(config?: InlineConfig): Promise<string[]> {
   const projectName =
     wxt.config.zip.name ??
     kebabCaseAlphanumeric(
-      (await getPackageJson())?.name || dirname(process.cwd()),
+      (await getPackageJson())?.name || path.dirname(process.cwd()),
     );
   const applyTemplate = (template: string): string =>
     template
@@ -43,31 +44,21 @@ export async function zip(config?: InlineConfig): Promise<string[]> {
   // ZIP output directory
 
   const outZipFilename = applyTemplate(wxt.config.zip.artifactTemplate);
-  const outZipPath = resolve(wxt.config.outBaseDir, outZipFilename);
-  await zipdir(wxt.config.outDir, {
-    saveTo: outZipPath,
-  });
+  const outZipPath = path.resolve(wxt.config.outBaseDir, outZipFilename);
+  await zipDir(wxt.config.outDir, outZipPath);
   zipFiles.push(outZipPath);
 
   // ZIP sources for Firefox
 
   if (wxt.config.browser === 'firefox') {
     const sourcesZipFilename = applyTemplate(wxt.config.zip.sourcesTemplate);
-    const sourcesZipPath = resolve(wxt.config.outBaseDir, sourcesZipFilename);
-    await zipdir(wxt.config.zip.sourcesRoot, {
-      saveTo: sourcesZipPath,
-      filter(path) {
-        const relativePath = relative(wxt.config.zip.sourcesRoot, path);
-
-        return (
-          wxt.config.zip.includeSources.some((pattern) =>
-            minimatch(relativePath, pattern),
-          ) ||
-          !wxt.config.zip.excludeSources.some((pattern) =>
-            minimatch(relativePath, pattern),
-          )
-        );
-      },
+    const sourcesZipPath = path.resolve(
+      wxt.config.outBaseDir,
+      sourcesZipFilename,
+    );
+    await zipDir(wxt.config.zip.sourcesRoot, sourcesZipPath, {
+      include: wxt.config.zip.includeSources,
+      exclude: wxt.config.zip.excludeSources,
     });
     zipFiles.push(sourcesZipPath);
   }
@@ -81,3 +72,51 @@ export async function zip(config?: InlineConfig): Promise<string[]> {
 
   return zipFiles;
 }
+async function zipDir(
+  directory: string,
+  outputPath: string,
+  options?: {
+    include?: string[];
+    exclude?: string[];
+    transform?: (
+      file: string,
+      content: string,
+    ) => Promise<string | undefined | void> | string | undefined | void;
+    additionalWork?: (archive: JSZip) => Promise<void> | void;
+  },
+): Promise<void> {
+  const archive = new JSZip();
+  const files = (
+    await glob('**/*', {
+      cwd: directory,
+      // Ignore node_modules, otherwise this glob step takes forever
+      ignore: ['**/node_modules'],
+      onlyFiles: true,
+    })
+  ).filter((relativePath) => {
+    return (
+      wxt.config.zip.includeSources.some((pattern) =>
+        minimatch(relativePath, pattern),
+      ) ||
+      !wxt.config.zip.excludeSources.some((pattern) =>
+        minimatch(relativePath, pattern),
+      )
+    );
+  });
+  for (const file of files) {
+    const absolutePath = path.resolve(directory, file);
+    if (file.endsWith('.json')) {
+      const content = await fs.readFile(absolutePath, 'utf-8');
+      archive.file(
+        file,
+        (await options?.transform?.(file, content)) || content,
+      );
+    } else {
+      const content = await fs.readFile(absolutePath);
+      archive.file(file, content);
+    }
+  }
+  await options?.additionalWork?.(archive);
+  const buffer = await archive.generateAsync({ type: 'base64' });
+  await fs.writeFile(outputPath, buffer, 'base64');
+}