diff --git a/scripts/spack/configs/versions.yaml b/scripts/spack/configs/versions.yaml
index ae6b113ac..53f0fe08e 100644
--- a/scripts/spack/configs/versions.yaml
+++ b/scripts/spack/configs/versions.yaml
@@ -29,7 +29,7 @@ packages:
     - spec: "@2024.07.0"
   sundials:
     require:
-    - spec: "@6.7.0"
+    - spec: "@7.4.0"
   tribol:
     require:
     - spec: "@0.1.0.21"
diff --git a/scripts/spack/packages/serac/package.py b/scripts/spack/packages/serac/package.py
index 643122840..09ac6e9d4 100644
--- a/scripts/spack/packages/serac/package.py
+++ b/scripts/spack/packages/serac/package.py
@@ -104,9 +104,8 @@ class Serac(CachedCMakePackage, CudaPackage, ROCmPackage):
         depends_on("py-sphinx")
 
     with when("+sundials"):
-        # Going to sundials@7: causes 80%+ test failures
-        depends_on("sundials@:6.999")
         # MFEM is deprecating the monitoring support with sundials v6.0 and later
+        depends_on("sundials@6:")
         # NOTE: Sundials must be built static to prevent the following runtime error:
         # "error while loading shared libraries: libsundials_nvecserial.so.6:
         # cannot open shared object file: No such file or directory"
diff --git a/src/serac/infrastructure/application_manager.cpp b/src/serac/infrastructure/application_manager.cpp
index 65547efde..c8d2843fc 100644
--- a/src/serac/infrastructure/application_manager.cpp
+++ b/src/serac/infrastructure/application_manager.cpp
@@ -65,6 +65,10 @@ void finalizer()
 #endif
 #endif
 
+#ifdef SERAC_USE_SUNDIALS
+  mfem::Sundials::Finalize();
+#endif
+
   profiling::finalize();
 
   int mpi_initialized = 0;