diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 215cc777..1c85638d 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -21,9 +21,9 @@ jobs:
     strategy:
       matrix:
         version:
-          - '1.9'
           - '1.10'
           - '1.11'
+          - '1.12'
     timeout-minutes: 30
     steps:
       - name: Checkout
diff --git a/.github/workflows/Downgrade.yml b/.github/workflows/Downgrade.yml
index 3b55acd8..179d21a9 100644
--- a/.github/workflows/Downgrade.yml
+++ b/.github/workflows/Downgrade.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: ['1.9', '1.10', '1.11']
+        version: ['1.10', '1.11', '1.12']
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@latest
diff --git a/Project.toml b/Project.toml
index 14363648..1f710467 100644
--- a/Project.toml
+++ b/Project.toml
@@ -40,7 +40,7 @@ Reexport = "1"
 SafeTestsets = "0.1"
 Statistics = "1"
 Test = "1"
-Unitful = "1"
+Unitful = "1.12.3"
 julia = "1.9"
 
 [extras]
diff --git a/src/Var.jl b/src/Var.jl
index 685b69f5..53824377 100644
--- a/src/Var.jl
+++ b/src/Var.jl
@@ -191,11 +191,9 @@ function _add_extra_lon_point(dims, data)
 
             # Add corresponding lon slice to the end of data along the index
             # corresponding to the longitude dimension
-            first_lon_slice = selectdim(data, idx, 1)
-            data = stack(
-                (eachslice(data, dims = idx)..., first_lon_slice),
-                dims = idx,
-            )
+            slice_indices = ntuple(i -> i == idx ? [1] : Colon(), ndims(data))
+            first_lon_slice = view(data, slice_indices...)
+            data = cat(data, first_lon_slice, dims = idx)
         end
     end