diff --git a/configs/common/modules_lmod.yaml b/configs/common/modules_lmod.yaml
index f8b79a575..4507e7145 100644
--- a/configs/common/modules_lmod.yaml
+++ b/configs/common/modules_lmod.yaml
@@ -134,6 +134,8 @@ modules:
           ^esmf@8.7.0+debug snapshot=none: 'esmf-8.7.0-debug'
           ^esmf@8.8.0~debug snapshot=none: 'esmf-8.8.0'
           ^esmf@8.8.0+debug snapshot=none: 'esmf-8.8.0-debug'
+          ^esmf@8.9.0b05~debug snapshot=b05: 'esmf-8.9.0b05'
+          ^esmf@8.9.0b05+debug snapshot=b05: 'esmf-8.9.0b05-debug'
       openmpi:
         environment:
           set:
diff --git a/configs/common/modules_tcl.yaml b/configs/common/modules_tcl.yaml
index c5aa45211..86a548bf9 100644
--- a/configs/common/modules_tcl.yaml
+++ b/configs/common/modules_tcl.yaml
@@ -136,6 +136,8 @@ modules:
           ^esmf@8.7.0+debug snapshot=none: 'esmf-8.7.0-debug'
           ^esmf@8.8.0~debug snapshot=none: 'esmf-8.8.0'
           ^esmf@8.8.0+debug snapshot=none: 'esmf-8.8.0-debug'
+          ^esmf@8.9.0b05~debug snapshot=b05: 'esmf-8.9.0b05'
+          ^esmf@8.9.0b05+debug snapshot=b05: 'esmf-8.9.0b05-debug'
       openmpi:
         environment:
           set:
diff --git a/configs/common/packages.yaml b/configs/common/packages.yaml
index c3c38304b..e4f470860 100644
--- a/configs/common/packages.yaml
+++ b/configs/common/packages.yaml
@@ -70,7 +70,7 @@ packages:
   esmf:
     require:
     - '~xerces ~pnetcdf +shared +external-parallelio'
-    - any_of: ['@=8.6.1 snapshot=none', '@=8.8.0 snapshot=none']
+    - any_of: ['@=8.6.1 snapshot=none', '@=8.8.0 snapshot=none', '@=8.9.0b05 snapshot=b05']
     - any_of: ['fflags="-fp-model precise" cxxflags="-fp-model precise"']
       when: "%intel"
       message: "Extra ESMF compile options for Intel"
diff --git a/configs/templates/neptune-dev/spack.yaml b/configs/templates/neptune-dev/spack.yaml
index ca2486c53..8ef00fce7 100644
--- a/configs/templates/neptune-dev/spack.yaml
+++ b/configs/templates/neptune-dev/spack.yaml
@@ -8,9 +8,9 @@ spack:
   definitions:
   - compilers: ['%aocc', '%apple-clang', '%gcc', '%intel', '%oneapi']
   - packages:
-      - neptune-env +espc ^esmf@=8.8.0
+      - neptune-env +espc ^esmf@=8.9.0b05 snapshot=b05
       # Comment out for Cole and Tusk or any other air-gapped system:
-      - neptune-python-env +xnrl ^neptune-env +espc ^esmf@=8.8.0
+      - neptune-python-env +xnrl ^neptune-env +espc ^esmf@=8.9.0b05 snapshot=b05
 
   specs:
     - matrix:
diff --git a/spack b/spack
index 58c9fb6aa..9432cbe9f 160000
--- a/spack
+++ b/spack
@@ -1 +1 @@
-Subproject commit 58c9fb6aa91e944ab05957d29586f6e100045610
+Subproject commit 9432cbe9fab792b6ae2094edb35cb02c91ae6f24