diff --git a/.github/workflows/Spack_Linux.yml b/.github/workflows/Spack_Linux.yml
index 1a8958dc..b511024f 100644
--- a/.github/workflows/Spack_Linux.yml
+++ b/.github/workflows/Spack_Linux.yml
@@ -35,7 +35,7 @@ jobs:
       run: |
         git clone -c feature.manyFiles=true https://github.com/spack/spack
         . spack/share/spack/setup-env.sh
-        spack env create grib-util-env
+        spack env create grib-util-env $GITHUB_WORKSPACE/grib-util/spack/spack.yaml
         spack env activate grib-util-env
         cp $GITHUB_WORKSPACE/grib-util/spack/package.py $SPACK_ROOT/var/spack/repos/builtin/packages/grib-util/package.py
         mv $GITHUB_WORKSPACE/grib-util $SPACK_ENV/grib-util
diff --git a/.github/workflows/Spack_MacOS.yml b/.github/workflows/Spack_MacOS.yml
index 6b2aa500..ad7d765b 100644
--- a/.github/workflows/Spack_MacOS.yml
+++ b/.github/workflows/Spack_MacOS.yml
@@ -33,7 +33,7 @@ jobs:
       run: |
         git clone -c feature.manyFiles=true https://github.com/spack/spack
         . spack/share/spack/setup-env.sh
-        spack env create grib-util-env
+        spack env create grib-util-env $GITHUB_WORKSPACE/grib-util/spack/spack.yaml
         spack env activate grib-util-env
         cp $GITHUB_WORKSPACE/grib-util/spack/package.py $SPACK_ROOT/var/spack/repos/builtin/packages/grib-util/package.py
         mv $GITHUB_WORKSPACE/grib-util $SPACK_ENV/grib-util
diff --git a/ci/spack.yaml b/ci/spack.yaml
deleted file mode 100644
index a69a4102..00000000
--- a/ci/spack.yaml
+++ /dev/null
@@ -1,20 +0,0 @@
-# Spack environment file to build NCEPLIBS-grib_util dependencies.
-#
-# Ed Hartnett 12/20/22
-spack:
-  packages:
-    all:
-      compiler:
-      - intel
-      - gcc@10:10
-  specs:
-  - bacio@2.5.0
-  - w3emc@2.10.0
-  - g2@3.4.6
-  - g2c@1.7.0
-  - sp@2.3.3
-  - ip@4.1.0
-  view: true
-  concretizer:
-    unify: true
-
diff --git a/spack/spack.yaml b/spack/spack.yaml
new file mode 100644
index 00000000..16893953
--- /dev/null
+++ b/spack/spack.yaml
@@ -0,0 +1,20 @@
+# Spack environment file to build NCEPLIBS-grib_util dependencies.
+#
+# Ed Hartnett 12/20/22
+spack:
+  packages:
+    bacio:
+      version: ['2.5.0']
+    w3emc:
+      version: ['2.10.0']
+    g2:
+      version: ['3.4.6']
+    g2c:
+      version: ['1.7.0']
+    sp:
+      version: ['2.3.3']
+    ip:
+      version: ['4.1.0']
+  view: false
+  concretizer:
+    unify: true