diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c0fb34ad2..6ab3280d1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -358,6 +358,13 @@ jobs:
           PGUSER: buzz
           PGPASSWORD: buzz_dev
           PGDATABASE: buzz
+          # Use the already-running docker postgres for desired-state planning instead of
+          # downloading an embedded Postgres from Maven Central (transient-fetch flake source).
+          PGSCHEMA_PLAN_HOST: localhost
+          PGSCHEMA_PLAN_PORT: "5432"
+          PGSCHEMA_PLAN_DB: buzz
+          PGSCHEMA_PLAN_USER: buzz
+          PGSCHEMA_PLAN_PASSWORD: buzz_dev
       - name: Download relay binary
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with: