diff --git a/env/rhel7/x86_64/admin/stable/spack.yaml b/env/rhel7/x86_64/admin/stable/spack.yaml
index 38ee16f..3ad758a 100644
--- a/env/rhel7/x86_64/admin/stable/spack.yaml
+++ b/env/rhel7/x86_64/admin/stable/spack.yaml
@@ -1,3 +1,4 @@
+---
 spack:
   concretizer:
     unify: false
@@ -8,9 +9,12 @@ spack:
     install_tree:
       root: $spack/opt/spack/stable
     include_concrete:
-    - $spack/spack-psi/env/$os/$target_family/admin/unstable
+      - $spack/spack-psi/env/$os/$target_family/admin/unstable
     include:
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
-    specs:
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
+  specs: null
+  mirrors:
+    local_stable: file:///afs/psi.ch/software/spack/stable
+    local_unstable: file:///afs/psi.ch/software/spack/unstable
   view: false
diff --git a/env/rhel7/x86_64/admin/testing/spack.yaml b/env/rhel7/x86_64/admin/testing/spack.yaml
index be294ed..8ce66c2 100644
--- a/env/rhel7/x86_64/admin/testing/spack.yaml
+++ b/env/rhel7/x86_64/admin/testing/spack.yaml
@@ -1,3 +1,4 @@
+---
 spack:
   concretizer:
     unify: false
@@ -13,11 +14,12 @@ spack:
       spack-instance-2:
         install_tree: $spack/opt/spack/unstable
     include:
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
-    specs:
-      - cp2k@2024.1%gcc~cuda
-      - opal@master%gcc
-      - opal@master%gcc ^openmpi
-      - py-alphafold@2.3.2%gcc~cuda
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
+  mirrors:
+    local_unstable: file:///afs/psi.ch/software/spack/unstable
+    local_testing: file:///afs/psi.ch/software/spack/testing
+  specs:
+    - cp2k@2024.1%gcc~cuda
+    - opal@master%gcc
   view: false
diff --git a/env/rhel7/x86_64/admin/unstable/spack.yaml b/env/rhel7/x86_64/admin/unstable/spack.yaml
index 8f09ecf..171d625 100644
--- a/env/rhel7/x86_64/admin/unstable/spack.yaml
+++ b/env/rhel7/x86_64/admin/unstable/spack.yaml
@@ -1,3 +1,4 @@
+---
 spack:
   concretizer:
     unify: false
@@ -11,9 +12,13 @@ spack:
       spack-instance-1:
         install_tree: $spack/opt/spack/stable
     include_concrete:
-    - $spack/spack-psi/env/$os/$target_family/admin/testing
+      - $spack/spack-psi/env/$os/$target_family/admin/testing
     include:
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
-    specs:
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
+  mirrors:
+    local_stable: file:///afs/psi.ch/software/spack/stable
+    local_unstable: file:///afs/psi.ch/software/spack/unstable
+    local_testing: file:///afs/psi.ch/software/spack/testing
+  specs: null
   view: false
diff --git a/env/sles15/x86_64/admin/stable/spack.yaml b/env/sles15/x86_64/admin/stable/spack.yaml
index 38ee16f..8d71272 100644
--- a/env/sles15/x86_64/admin/stable/spack.yaml
+++ b/env/sles15/x86_64/admin/stable/spack.yaml
@@ -1,3 +1,4 @@
+---
 spack:
   concretizer:
     unify: false
@@ -8,9 +9,12 @@ spack:
     install_tree:
       root: $spack/opt/spack/stable
     include_concrete:
-    - $spack/spack-psi/env/$os/$target_family/admin/unstable
+      - $spack/spack-psi/env/$os/$target_family/admin/unstable
     include:
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
-    - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
-    specs:
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
+      - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
+  mirrors:
+    local_stable: file:///afs/psi.ch/software/spack/stable
+    local_unstable: file:///afs/psi.ch/software/spack/unstable
+  specs: null
   view: false
diff --git a/env/sles15/x86_64/admin/testing/spack.yaml b/env/sles15/x86_64/admin/testing/spack.yaml
index 2454bd1..fd0ac25 100644
--- a/env/sles15/x86_64/admin/testing/spack.yaml
+++ b/env/sles15/x86_64/admin/testing/spack.yaml
@@ -15,8 +15,11 @@ spack:
     include:
     - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
     - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
-    specs:
-      - opal@master%gcc@12.3
-      - cp2k@2024.1%gcc@12.3~cuda
-      - py-alphafold@2.3.2~cuda
+  mirrors:
+    local_unstable: file:///afs/psi.ch/software/spack/unstable
+    local_testing: file:///afs/psi.ch/software/spack/testing
+  specs:
+    - cp2k@2024.1%gcc~cuda
+    - opal@master%gcc
+    - opal@master%gcc ^openmpi
   view: false
diff --git a/env/sles15/x86_64/admin/unstable/spack.yaml b/env/sles15/x86_64/admin/unstable/spack.yaml
index 8f09ecf..80e9192 100644
--- a/env/sles15/x86_64/admin/unstable/spack.yaml
+++ b/env/sles15/x86_64/admin/unstable/spack.yaml
@@ -15,5 +15,9 @@ spack:
     include:
     - $spack/spack-psi/env/$os/$target_family/sysconfigs/packages.yaml
     - $spack/spack-psi/env/$os/$target_family/sysconfigs/compilers.yaml
-    specs:
+  mirrors:
+    local_stable: file:///afs/psi.ch/software/spack/stable
+    local_unstable: file:///afs/psi.ch/software/spack/unstable
+    local_testing: file:///afs/psi.ch/software/spack/testing
+  specs:
   view: false