diff --git a/composer.json b/composer.json
index 3ba9ab3..6503915 100644
--- a/composer.json
+++ b/composer.json
@@ -23,6 +23,7 @@
     "drupal/clientside_validation": "3.0.0-rc4",
     "drupal/coc_forms_auto_export": "2.0.0-alpha1",
     "drupal/config_entity_revisions": "^1.7.0",
+    "drupal/diff": "^1.0",
     "drupal/events_logging": "^1.5",
     "drupal/embed": "^1.4",
     "drupal/header_and_footer_scripts": "^3.0",
@@ -74,6 +75,9 @@
       },
       "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"
+      },
+      "drupal/smtp": {
+        "Duplicated attachments in emails generated by Webform: (https://www.drupal.org/project/smtp/issues/2995290)": "https://www.drupal.org/files/issues/2021-11-02/smtp-2995290-23.patch"
       }
     }
   }
diff --git a/os2forms_forloeb.info.yml b/os2forms_forloeb.info.yml
index 3ecebda..13214e2 100644
--- a/os2forms_forloeb.info.yml
+++ b/os2forms_forloeb.info.yml
@@ -9,6 +9,7 @@ dependencies:
   - admin_toolbar_tools
   - coc_forms_auto_export
   - config_entity_revisions
+  - diff
   - entity_print
   - eu_cookie_compliance
   - events_logging