diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 6fac6d36..c3358d1a 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -24,6 +24,34 @@ jobs:
         run: composer install --no-dev --no-interaction --optimize-autoloader
       - name: Composer build
         run: composer run-script build
+      # "composer build" leaves the ready-to-ship distribution in ./multisite-language-switcher
+      # (bin/git-release.sh rsyncs the repository through .distignore). Everything after that
+      # point - including the "composer update" that restores the require-dev packages for
+      # local development - only touches the working tree, never the build directory.
+      - name: Verify the build directory
+        run: |
+          BUILD_DIR=multisite-language-switcher
+          test -d "$BUILD_DIR" || { echo "::error::$BUILD_DIR was not created by composer build"; exit 1; }
+          for required in MultisiteLanguageSwitcher.php readme.txt vendor/autoload.php; do
+            test -e "$BUILD_DIR/$required" || { echo "::error::$BUILD_DIR/$required is missing"; exit 1; }
+          done
+          for forbidden in .git .github docs src tests node_modules composer.lock package.json; do
+            test ! -e "$BUILD_DIR/$forbidden" || { echo "::error::$BUILD_DIR/$forbidden must not be shipped"; exit 1; }
+          done
+          php -r '
+            $lock  = json_decode(file_get_contents("composer.lock"), true);
+            $found = [];
+            foreach ($lock["packages-dev"] as $package) {
+                if (is_dir("multisite-language-switcher/vendor/" . $package["name"])) {
+                    $found[] = $package["name"];
+                }
+            }
+            if ($found) {
+                fwrite(STDERR, "::error::require-dev packages in the build directory: " . implode(", ", $found) . PHP_EOL);
+                exit(1);
+            }
+          '
+          echo "Build directory holds $(find "$BUILD_DIR" -type f | wc -l) files, production dependencies only."
       - name: WordPress Plugin Deploy
         uses: 10up/action-wordpress-plugin-deploy@stable
         id: deploy
@@ -31,6 +59,11 @@ jobs:
           SVN_PASSWORD: ${{ secrets.SVN_PASSWORD }}
           SVN_USERNAME: ${{ secrets.SVN_USERNAME }}
           SLUG: multisite-language-switcher
+          # Deploy only the built distribution. Without this the action falls back to
+          # rsyncing the whole workspace through .distignore - which cannot exclude vendor/,
+          # so the require-dev packages restored by "composer build" ended up in the SVN
+          # transaction and broke the 3.0.0 release.
+          BUILD_DIR: multisite-language-switcher
         with:
           generate-zip: true
       - name: Attest build provenance
diff --git a/Changelog.md b/Changelog.md
index 98d40fe2..5dd818e7 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,5 +1,8 @@
-## 3.0.0
+## 3.0.1
+* Fix: the WordPress.org deploy pushed the whole workspace instead of the built distribution.
+* No changes to the plugin itself - the shipped code is identical to 3.0.0.
 
+## 3.0.0
 * Add Quick Create for translations: create the translated post straight from the editor metabox, or pick a source post on the new "Add from Translation" submenu (single and bulk), backed by a REST endpoint and switchable in the settings.
 * Add `msls_quick_create_capability` so integrations can override the Quick Create permission checks, plus filters for the post data, the inserted post, the response, the untranslated-posts list, and the mapped taxonomy terms.
 * Add filter hooks for the AJAX suggest results of the post and term metaboxes.
@@ -22,7 +25,6 @@
 * Documentation: update README.md code snippets to reflect new function names.
 
 ## 2.10.0
-
 * Add prefixed public helper functions (msls_get_*, msls_the_switcher) with deprecation shims for legacy names to satisfy WPCS while staying backward compatible.
 * Expose action hook names as constants for safer programmatic use.
 * Accessibility: add aria-current="page" on the active language link.
diff --git a/MultisiteLanguageSwitcher.php b/MultisiteLanguageSwitcher.php
index d5bb7b6e..94345d6e 100644
--- a/MultisiteLanguageSwitcher.php
+++ b/MultisiteLanguageSwitcher.php
@@ -3,7 +3,7 @@
  * Multisite Language Switcher Plugin
  *
  * Plugin Name: Multisite Language Switcher
- * Version: 3.0.0
+ * Version: 3.0.1
  * Plugin URI: http://msls.co/
  * Description: A simple but powerful plugin that will help you to manage the relations of your contents in a multilingual multisite-installation.
  * Author: Dennis Ploetner
@@ -42,7 +42,7 @@
  * @author Dennis Ploetner <re@lloc.de>
  */
 if ( ! defined( 'MSLS_PLUGIN_VERSION' ) ) {
-	define( 'MSLS_PLUGIN_VERSION', '3.0.0' );
+	define( 'MSLS_PLUGIN_VERSION', '3.0.1' );
 	define( 'MSLS_PLUGIN_PATH', plugin_basename( __FILE__ ) );
 	define( 'MSLS_PLUGIN__FILE__', __FILE__ );
 
diff --git a/readme.txt b/readme.txt
index de46f3e5..1fd3d643 100644
--- a/readme.txt
+++ b/readme.txt
@@ -6,7 +6,7 @@ Tags: multilingual, multisite, language, switcher, localization
 Requires at least: 6.1
 Tested up to: 7.1
 Requires PHP: 7.4
-Stable tag: 3.0.0
+Stable tag: 3.0.1
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -57,9 +57,7 @@ It's up to you - of course. But yes, if you want to use the Multisite Language S
 
 = How can I automatically redirect users based on the browser language? =
 
-The Multisite Language Switcher does not redirect the users automatically. I'm not sure if the plugin should do that. You might check out this [jQuery plugin](
-https://github.com/danieledesantis/jquery-language-detection) or [this approach with a theme](https://github.com/oncleben31/Multisite-Language-Switcher-Theme)
-if you need such functionality.
+The Multisite Language Switcher does not redirect the users automatically. I'm not sure if the plugin should do that.
 
 = How can I add the Multisite Language Switcher to the nav menu of my blog? =
 
@@ -95,6 +93,11 @@ Please visit the [MSLS website](https://msls.co/) or use the [WordPress support
 
 == Changelog ==
 
+= 3.0.1 =
+
+* Fixed: 3.0.0 could not be published on WordPress.org
+* The plugin code is identical to 3.0.0.
+
 = 3.0.0 =
 
 * New: Quick Create - create the translated post straight from the editor metabox, or pick a source post on the new `Add from Translation` submenu (single and bulk). Backed by a REST endpoint and switchable in the settings.
@@ -126,6 +129,12 @@ The full history is kept in the separate [Changelog](https://github.com/lloc/Mul
 
 == Upgrade Notice ==
 
+= 3.0.1 =
+
+Republishes 3.0.0, whose upload to WordPress.org failed. The plugin code is unchanged
+against 3.0.0 - only the release pipeline was fixed. See the 3.0.0 notice below for what
+the major release brings.
+
 = 3.0.0 =
 
 Major release. The class structure moved into sub-namespaces, but every pre-3.0 class name
diff --git a/src/msls-widget-block/block.json b/src/msls-widget-block/block.json
index 44895a5e..ea9d5e9c 100644
--- a/src/msls-widget-block/block.json
+++ b/src/msls-widget-block/block.json
@@ -5,7 +5,7 @@
   "icon": "translation",
   "category": "widgets",
   "name": "lloc/msls-widget-block",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "description": "Review the settings for the Multisite Language Switcher plugin, as the block utilizes the API function `msls_the_switcher()` for its output.",
   "example": {},
   "supports": {