diff --git a/.github/build-ci/data/standard.json b/.github/build-ci/data/standard.json
index f3311d5..6edcaa4 100644
--- a/.github/build-ci/data/standard.json
+++ b/.github/build-ci/data/standard.json
@@ -1,7 +1,7 @@
 {
-    "gcc_compiler": "gcc@13.2.0",
-    "intel_compiler": "intel@2021.10.0",
-    "oneapi_compiler": "oneapi@2025.2.0",
+    "gcc_compiler_version": "13.2.0",
+    "intel_compiler_version": "2021.10.0",
+    "oneapi_compiler_version": "2025.2.0",
     "target": "x86_64",
     "all_configurations": "MOM6,CICE6,WW3,MOM6-WW3,MOM6-CICE6,CICE6-WW3,MOM6-CICE6-WW3"
 }
diff --git a/.github/build-ci/manifests/gcc.spack.yaml.j2 b/.github/build-ci/manifests/gcc.spack.yaml.j2
index 2c97560..e77d788 100644
--- a/.github/build-ci/manifests/gcc.spack.yaml.j2
+++ b/.github/build-ci/manifests/gcc.spack.yaml.j2
@@ -5,9 +5,13 @@ spack:
     access3-share:
       require:
         '@git.{{ ref }}=stable'
+    gcc:
+      require:
+      - '@{{ gcc_compiler_version }}'
     all:
       require:
-      - '%{{ gcc_compiler }} target={{ target }}'
+      - '%access_gcc'
+      - target={{ target }}
   concretizer:
     unify: false
   view: false
diff --git a/.github/build-ci/manifests/intel-libonly.spack.yaml.j2 b/.github/build-ci/manifests/intel-libonly.spack.yaml.j2
index 0628fde..51debcf 100644
--- a/.github/build-ci/manifests/intel-libonly.spack.yaml.j2
+++ b/.github/build-ci/manifests/intel-libonly.spack.yaml.j2
@@ -3,9 +3,18 @@ spack:
   - access3-share @git.{{ ref }}=stable
   - access3-share @git.{{ ref }}=stable +openmp
   packages:
+    # We pin a version of python as spack v1.1 has trouble building the default latest 
+    # python@3.14.3%intel@2021.10.0 due to a segfault. 
+    python:
+      require:
+      - '@3.11.14'
+    intel-oneapi-compilers-classic:
+      require:
+      - '@{{ intel_compiler_version }}'
     all:
       require:
-      - '%{{ intel_compiler }} target={{ target }}'
+      - '%access_intel'
+      - target={{ target }}
   concretizer:
     unify: false
   view: false
diff --git a/.github/build-ci/manifests/intel.spack.yaml.j2 b/.github/build-ci/manifests/intel.spack.yaml.j2
index 5dcba1d..56917de 100644
--- a/.github/build-ci/manifests/intel.spack.yaml.j2
+++ b/.github/build-ci/manifests/intel.spack.yaml.j2
@@ -5,9 +5,18 @@ spack:
     access3-share:
       require:
         '@git.{{ ref }}=stable'
+    # We pin a version of python as spack v1.1 has trouble building the default latest 
+    # python@3.14.3%intel@2021.10.0 due to a segfault. 
+    python:
+      require:
+      - '@3.11.14'
+    intel-oneapi-compilers-classic:
+      require:
+      - '@{{ intel_compiler_version }}'
     all:
       require:
-      - '%{{ intel_compiler }} target={{ target }}'
+      - '%access_intel'
+      - target={{ target }}
   concretizer:
     unify: false
   view: false
diff --git a/.github/build-ci/manifests/oneapi.spack.yaml.j2 b/.github/build-ci/manifests/oneapi.spack.yaml.j2
index e6fe871..7cd2cd3 100644
--- a/.github/build-ci/manifests/oneapi.spack.yaml.j2
+++ b/.github/build-ci/manifests/oneapi.spack.yaml.j2
@@ -7,10 +7,14 @@ spack:
         '@git.{{ ref }}=stable'
     gcc-runtime:
       require:
-        '%gcc'
+        '%access_gcc'
+    intel-oneapi-compilers:
+      require:
+      - '@{{ oneapi_compiler_version }}'
     all:
       require:
-      - '%{{ oneapi_compiler }} target={{ target }}'
+      - '%access_oneapi'
+      - target={{ target }}
   concretizer:
     unify: false
   view: false
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fddaf66..378fe0e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,11 +30,10 @@ jobs:
       max-parallel: 5
       matrix:
         file: ${{ fromJson(needs.pre-ci.outputs.matrix) }}
-    uses: access-nri/build-ci/.github/workflows/ci.yml@v2
+    uses: access-nri/build-ci/.github/workflows/ci.yml@v3
     with:
       spack-manifest-path: ${{ matrix.file }}
       allow-ssh-into-spack-install: false  # If true, PR author must ssh into instance to complete job
       spack-manifest-data-path: .github/build-ci/data/standard.json
-      # spack-packages-ref: main
-      # spack-config-ref: main
-      # spack-ref: releases/v0.22
+      # Default args (including explicit spack/spack-packages/spack-config versions)
+      # are specified in https://github.com/ACCESS-NRI/build-ci/tree/v3/.github/workflows#inputs