diff --git a/.github/workflows/spack_default_build.yaml b/.github/workflows/spack_default_build.yaml
index 206c68f1e..94f0270fa 100644
--- a/.github/workflows/spack_default_build.yaml
+++ b/.github/workflows/spack_default_build.yaml
@@ -7,7 +7,7 @@ env:
   # Our repo name contains upper case characters, so we can't use ${{ github.repository }}
   IMAGE_NAME: gridkit
   USERNAME: gridkit-bot
-  BASE_VERSION: ubuntu-24.04-fortran-v0.2.2
+  BASE_VERSION: ubuntu-24.04-fortran-v0.2.8
 
 # Until we remove the need to clone submodules to build, this should on be in PRs
 on: [pull_request]
@@ -125,7 +125,7 @@ jobs:
                 padded_length: 128
             mirrors:
               local-buildcache: oci://${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-              spack: https://binaries.spack.io/develop
+              spack: https://binaries.spack.io/v0.23.1
             packages:
               llvm:
                 externals:
diff --git a/buildsystem/spack/spack b/buildsystem/spack/spack
index 6ff72a5b1..ea19f8537 160000
--- a/buildsystem/spack/spack
+++ b/buildsystem/spack/spack
@@ -1 +1 @@
-Subproject commit 6ff72a5b1af5925c3ac36d90e4e13f5f53d4b725
+Subproject commit ea19f8537f56b5634e5f7b35f006deb2a91b580c