diff --git a/packages/backend/test-federation/.config/dummy.yml b/packages/backend/test-federation/.config/dummy.yml
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/backend/test-federation/compose.tpl.yml b/packages/backend/test-federation/compose.tpl.yml
index a50f5e5345..1404345e2a 100644
--- a/packages/backend/test-federation/compose.tpl.yml
+++ b/packages/backend/test-federation/compose.tpl.yml
@@ -22,6 +22,10 @@ services:
         source: ../../../built
         target: /misskey/built
         read_only: false
+      - type: bind
+        source: ./.config/dummy.yml
+        target: /misskey/.config/default.yml
+        read_only: true
       - type: bind
         source: ../assets
         target: /misskey/packages/backend/assets