diff --git a/env/sles15/x86_64/users/stable/spack.yaml b/env/sles15/x86_64/users/stable/spack.yaml
index 5a698e0..d0a9498 100644
--- a/env/sles15/x86_64/users/stable/spack.yaml
+++ b/env/sles15/x86_64/users/stable/spack.yaml
@@ -1,16 +1,16 @@
 spack:
   concretizer:
     unify: false
-  config:
-    allow_sgid: false
-    build_stage:
-      - $spack/../user/$user/spack-stage
-    install_tree:
-      root: $spack/../user/$user/spack-install
   include:
     - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
     - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
+  include_concrete:
+    - /afs/psi.ch/sys/spack/system/spack-psi/env/$os/$target_family/admin/stable
   mirrors:
     local_stable: file:///afs/psi.ch/software/spack/stable
   specs: []
+  upstreams:
+    stable:
+      install_tree: >-
+        $spack/opt/spack/stable/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__
   view: false
diff --git a/env/sles15/x86_64/users/unstable/spack.yaml b/env/sles15/x86_64/users/unstable/spack.yaml
index b58f29e..6f1335f 100644
--- a/env/sles15/x86_64/users/unstable/spack.yaml
+++ b/env/sles15/x86_64/users/unstable/spack.yaml
@@ -4,7 +4,17 @@ spack:
   include:
   - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
   - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
+  include_concrete:
+    - /afs/psi.ch/sys/spack/system/spack-psi/env/$os/$target_family/admin/stable
+    - /afs/psi.ch/sys/spack/system/spack-psi/env/$os/$target_family/admin/unstable
   mirrors:
     local_unstable: file:///afs/psi.ch/software/spack/unstable
   specs: []
+  upstreams:
+    stable:
+      install_tree: >-
+        $spack/opt/spack/stable/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__
+    unstable:
+      install_tree: >-
+        $spack/opt/spack/unstable/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder__/__spack_path_placeholder_
   view: false