diff --git a/env/rhel7/x86_64/admin/unstable/spack.yaml b/env/rhel7/x86_64/admin/unstable/spack.yaml
index a68c93e..a5cfbca 100644
--- a/env/rhel7/x86_64/admin/unstable/spack.yaml
+++ b/env/rhel7/x86_64/admin/unstable/spack.yaml
@@ -20,5 +20,6 @@ spack:
     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: []
+  specs:
+    - gcc@12.3.0
   view: false