diff --git a/build/composer.json b/build/composer.json
index ed627c91..1ada4002 100644
--- a/build/composer.json
+++ b/build/composer.json
@@ -342,7 +342,7 @@
     "drupal/mailsystem": "4.4",
     "drupal/media_entity_browser": "2.0-alpha4",
     "drupal/metatag": "1.26",
-    "drupal/mimemail": "1.0.0-alpha5",
+    "drupal/mimemail": "1.0.0-alpha6",
     "drupal/multiple_selects": "1.1",
     "drupal/node_edit_protection": "1.1",
     "drupal/noreqnewpass": "1.3",