diff --git a/.govuk_dependabot_merger.yml b/.govuk_dependabot_merger.yml
index b182701d09..6a9f3302f6 100644
--- a/.govuk_dependabot_merger.yml
+++ b/.govuk_dependabot_merger.yml
@@ -2,3 +2,30 @@ api_version: 2
 defaults:
   auto_merge: true
   update_external_dependencies: true
+overrides:
+  - dependency: rails
+    auto_merge: false
+  - dependency: railties
+    auto_merge: false
+  - dependency: actioncable
+    auto_merge: false
+  - dependency: actionmailbox
+    auto_merge: false
+  - dependency: actionmailer
+    auto_merge: false
+  - dependency: actionpack
+    auto_merge: false
+  - dependency: actiontext
+    auto_merge: false
+  - dependency: actionview
+    auto_merge: false
+  - dependency: activejob
+    auto_merge: false
+  - dependency: activemodel
+    auto_merge: false
+  - dependency: activerecord
+    auto_merge: false
+  - dependency: activestorage
+    auto_merge: false
+  - dependency: activesupport
+    auto_merge: false