diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index abc7c1f2a..849f76700 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,7 @@ jobs:
     uses: access-nri/build-ci/.github/workflows/ci-github-hosted.yml@v2
     with:
       spack-manifest-path: ${{ matrix.spack-manifest-path }}
+      spack-config-ref: 2025.11.000  # Before build-ci@v2-breaking change to spack-config, don't go any further forward!
       spack-packages-ref: api-v2  # This branch contains the package defs compatible with spack >=1.0. May be incorporated into the main branch
       spack-ref: releases/v1.0
       allow-ssh-into-spack-install: false