diff --git a/spack.yaml b/spack.yaml
index c317c3757db7bfe6447e216003212e48399cb2cd..41d221cdd4bfada10d4f7727a02f6e5a8cbdf011 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -45,7 +45,8 @@ spack:
   mirrors:
     local_something: /builds/akarmas/ebrains-spack-builds/jobs_scratch_dir/local_mirror
     # some random cache :p (build_cache/ gets added)
-    hacky_cache: https://brainscales-r.kip.uni-heidelberg.de:7443/nmpi/tmp
+    #hacky_cache: https://brainscales-r.kip.uni-heidelberg.de:7443/nmpi/tmp
+    ebrains_cache: https://object.cscs.ch/v1/AUTH_9c619ee75cab4993b1c4c86a37586357/test_spack/tc-tmp-cache
     public_mirror: https://spack-llnl-mirror.s3-us-west-2.amazonaws.com/
 
   gitlab-ci:
@@ -73,6 +74,9 @@ spack:
       - spack env activate --without-view ${SPACK_CONCRETE_ENV_DIR}
       - spack -d ci rebuild
       - ls -ltr /builds/akarmas/ebrains-spack-builds/jobs_scratch_dir/local_mirror
+      - ls -ltr /builds/akarmas/ebrains-spack-builds/jobs_scratch_dir/mirror
+      - ls -ltr /builds/emuller/brainscales-spack-test/jobs_scratch_dir/local_mirror
+      - ls -ltr /builds/emuller/brainscales-spack-test/jobs_scratch_dir/mirror
 
     # all in artifacts (no shared filesystem...)
     enable-artifacts-buildcache: True