diff --git a/modulefiles/prepobs_hera.lua b/modulefiles/prepobs_hera.lua
index 6c1c70a..cb8046e 100644
--- a/modulefiles/prepobs_hera.lua
+++ b/modulefiles/prepobs_hera.lua
@@ -2,8 +2,7 @@ help([[
 Load environment to build prepobs on Hera
 ]])
 
-prepend_path("MODULEPATH", pathJoin("/scratch1/NCEPDEV/nems/role.epic/spack-stack/spack-stack-" .. (os.getenv("spack_stack_ver") or "None"), "/envs/" .. (os.getenv("spack_env") or "None"), "-dev-rocky8/install/modulefiles/Core")
-
+prepend_path("MODULEPATH", "/scratch1/NCEPDEV/nems/role.epic/spack-stack/spack-stack-1.6.0/envs/gsi-addon-dev-rocky8/install/modulefiles/Core")
 
 stack_intel_ver=os.getenv("stack_intel_ver") or "2021.5.0"
 stack_impi_ver=os.getenv("stack_impi_ver") or "2021.5.1"
diff --git a/modulefiles/prepobs_hercules.lua b/modulefiles/prepobs_hercules.lua
index 9781f20..c72b5af 100644
--- a/modulefiles/prepobs_hercules.lua
+++ b/modulefiles/prepobs_hercules.lua
@@ -1,8 +1,8 @@
 help([[
-Load environment to build prepobs on Orion
+Load environment to build prepobs on Hercules
 ]])
 
-prepend_path("MODULEPATH", pathJoin("/work/noaa/epic/role-epic/spack-stack/hercules/spack-stack-" .. (os.getenv("spack_stack_ver") or "None"), "/envs/" .. (os.getenv("spack_env") or "None"), "-env/install/modulefiles/Core")
+prepend_path("MODULEPATH", "/work/noaa/epic/role-epic/spack-stack/hercules/spack-stack-1.6.0/envs/gsi-addon-env/install/modulefiles/Core")
 
 stack_intel_ver=os.getenv("stack_intel_ver") or "2021.9.0"
 stack_impi_ver=os.getenv("stack_impi_ver") or "2021.9.0"
diff --git a/modulefiles/prepobs_jet.lua b/modulefiles/prepobs_jet.lua
index f249dd0..be13b33 100644
--- a/modulefiles/prepobs_jet.lua
+++ b/modulefiles/prepobs_jet.lua
@@ -2,7 +2,7 @@ help([[
 Load environment to build prepobs on Jet
 ]])
 
-prepend_path("MODULEPATH", pathJoin("/mnt/lfs4/HFIP/hfv3gfs/role.epic/spack-stack/spack-stack-" .. (os.getenv("spack_stack_ver") or "None"), "/envs/" .. (os.getenv("spack_env") or "None"), "-dev-rocky8/install/modulefiles/Core")
+prepend_path("MODULEPATH", "/mnt/lfs4/HFIP/hfv3gfs/role.epic/spack-stack/spack-stack-1.6.0/envs/gsi-addon-dev-rocky8/install/modulefiles/Core")
 
 stack_intel_ver=os.getenv("stack_intel_ver") or "2021.5.0"
 stack_impi_ver=os.getenv("stack_impi_ver") or "2021.5.1"