diff --git a/composer.json b/composer.json
index dc575ab..01093bf 100644
--- a/composer.json
+++ b/composer.json
@@ -108,6 +108,7 @@
         "drupal/migrate_tools": "^6",
         "drupal/migrate_upgrade": "^4",
         "drupal/minimalhtml": "^2",
+        "drupal/mposse": "^1",
         "drupal/multiparagraph_flow": "^1.0@dev",
         "drupal/node_view_permissions": "^1.4",
         "drupal/noreferrer": "^1",
@@ -141,6 +142,7 @@
         "drupal/smart_date": "^4.0",
         "drupal/sms": "^2.0",
         "drupal/social_post_facebook": "3.0.x-dev@dev",
+        "drupal/social_post_mastodon": "3.0.x-dev@dev",
         "drupal/social_post_twitter": "3.x-dev@dev",
         "drupal/stringoverrides": "^1.8",
         "drupal/stripe_webform": "^2",