diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ecaa8e..a3bedf8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,9 @@ before starting to add changes. Use example [placed in the end of the page](#exa
 
 ## [Unreleased]
 
+- [PR-176](https://github.com/OS2Forms/os2forms/pull/176)
+  - Patches `coc_forms_auto_export` to ensure attachments are added to emails,
+    cf. [Unable to receive attachments in emails sent](https://www.drupal.org/project/coc_forms_auto_export/issues/3256951)
 - [PR-168](https://github.com/OS2Forms/os2forms/pull/168)
   Cleaned up code
 - [PR-166](https://github.com/OS2Forms/os2forms/pull/166)
@@ -365,7 +368,8 @@ f/OS-115_dawa_address
 - Security in case of vulnerabilities.
 ```
 
-[Unreleased]: https://github.com/OS2Forms/os2forms/compare/3.22.2...HEAD
+[Unreleased]: https://github.com/OS2Forms/os2forms/compare/4.0.0...HEAD
+[4.0.0]: https://github.com/OS2Forms/os2forms/compare/3.22.2...4.0.0
 [3.22.2]: https://github.com/OS2Forms/os2forms/compare/3.22.1...3.22.2
 [3.22.1]: https://github.com/OS2Forms/os2forms/compare/3.22.0...3.22.1
 [3.22.0]: https://github.com/OS2Forms/os2forms/compare/3.21.2...3.22.0
diff --git a/composer.json b/composer.json
index d553917..5f20db3 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "drupal/advancedqueue": "^1.0",
         "drupal/cache_control_override": "^1.1 || ^2.0",
         "drupal/clientside_validation": "^4.0",
-        "drupal/coc_forms_auto_export": "^2.0@alpha",
+        "drupal/coc_forms_auto_export": "^3.0@alpha",
         "drupal/config_entity_revisions": "2.0.x-dev",
         "drupal/diff": "^1.0",
         "drupal/embed": "^1.4",
@@ -115,9 +115,7 @@
         "enable-patching": true,
         "patches": {
             "drupal/coc_forms_auto_export": {
-                "3240592 - Problem with phpseclib requirement in 2.x (https://www.drupal.org/project/coc_forms_auto_export/issues/3240592)": "https://www.drupal.org/files/issues/2021-10-04/requirement-namespace-3240592-1.patch",
-                "3286562 - Automated Drupal 10 compatibility fixes": "https://www.drupal.org/files/issues/2022-06-15/coc_forms_auto_export.2.0.x-dev.rector.patch",
-                "3259009 - PHP Warnings/Notices on Download Page": "https://git.drupalcode.org/project/coc_forms_auto_export/-/merge_requests/1.diff"
+                "3256951: - Unable to receive attachments in emails sent": "https://git.drupalcode.org/project/coc_forms_auto_export/-/merge_requests/11.diff"
             },
             "drupal/entity_print": {
                 "2733781 - Add Export to Word Support": "https://www.drupal.org/files/issues/2019-11-22/2733781-47.patch"