diff --git a/.github/workflows/spack_default_build.yaml b/.github/workflows/spack_default_build.yaml
index e0a09e4b2..60d9144aa 100644
--- a/.github/workflows/spack_default_build.yaml
+++ b/.github/workflows/spack_default_build.yaml
@@ -142,7 +142,7 @@ jobs:
               mumps:
                 require: ~mpi~openmp
               sundials:
-                require: '@develop'
+                require: '@7.4.0'
               llvm:
                 externals:
                 - spec: llvm@${{ matrix.llvm }}
diff --git a/buildsystem/spack/spack b/buildsystem/spack/spack
index 4c05697f7..ba17e3f5f 160000
--- a/buildsystem/spack/spack
+++ b/buildsystem/spack/spack
@@ -1 +1 @@
-Subproject commit 4c05697f7518269c4fd8bdb9d85cb4d124c60d01
+Subproject commit ba17e3f5fde40fd3012f41929712b2d877c8cf56