diff --git a/.github/workflows/postman.yml b/.github/workflows/postman.yml
index 07ebd1f..3c21a3d 100644
--- a/.github/workflows/postman.yml
+++ b/.github/workflows/postman.yml
@@ -30,4 +30,8 @@ jobs:
     with:
       collections: "Fleetbase Ledger API"
       build-from-source: false
+      # Without this the run tests the version of fleetbase/ledger-api baked into the
+      # published image, not the branch under review. The workflow checks this
+      # repository out at the commit under test and swaps it into the container.
+      overlay-package: fleetbase/ledger-api
     secrets: inherit